Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Syunsuke Kimura

Daizaburo Matsuki

Tomoko Iiyama

Masayuki Takahashi

Yoshiharu Yamamoto

Katsuaki Mitani

Naoto Yumiki

Takaaki Gyoten

Takayuki Hayashi

Yoshimasa Fushimi

Masahiro Kawashima

Seiichi Suzuki

Tomoya Inoue

An illuminating lens () includes a light entrance surface (), a light exit surface (), and a bottom surface (). The light entrance surface () has a first light entrance surface () and a second light entrance surface (). The first light entrance surface () is a curved surface convex toward the light exit surface () and perpendicularly intersecting an optical axis A, and the second light entrance surface () extends outwardly from an edge of the first light entrance surface () and is connected obliquely to an inner edge of the bottom surface (). In a cross section in a light spreading direction, &#x3b8;1 has a negative value at the first light entrance surface () and a positive value at the second light entrance surface (), where &#x3b8;1 is a refraction angle at which virtual light reaching the light entrance surface () directly from a starting point Q on the optical axis A corresponding to a position of a light source () passes through the light entrance surface (), and &#x3b8;1 is defined as negative when &#x3b8;1 is on the side of the optical axis A with respect to a normal N to the light entrance surface () and as positive when &#x3b8;1 is on the opposite side.

Illuminating lens, lighting device, surface light source, and liquid crystal display apparatus

A light exit surface of an illuminating lens has a first light exit surface and a second light exit surface. The first light exit surface is recessed toward a point on the optical axis, and the second light exit surface extends outwardly from the periphery of the first light exit surface. The first light exit surface has a transmissive region and a total reflection region. When the position of a light source on the optical axis is defined as a starting point, the transmissive region transmits light that has been emitted from the starting point at a relatively small angle with respect to the optical axis, and the total reflection region totally reflects light that has been emitted from the starting point at a relatively large angle with respect to the optical axis. A bottom surface that surrounds a light entrance surface and faces oppositely to the light exit surface is provided with a projecting portion or a recessed portion for reflecting light that has been emitted from the light source, totally reflected repeatedly at the light exit surface, and then reached the bottom surface.

Illuminating lens, lighting device, surface light source, and liquid-crystal display apparatus

An illuminating lens includes a main body and a ring portion. The main body has a light exit surface, and the light exit surface has a first light exit surface recessed toward a point on the optical axis and a second light exit surface extending outwardly from the periphery of the first light exit surface. The first light exit surface has a transmissive region in the center thereof, and a total reflection region on the peripheral side thereof. The ring portion has a back surface configured to guide the light that has been emitted from a light source, totally reflected repeatedly at the light exit surface, and then entered the ring portion to an end surface by total reflection.

A light exit surface of an illuminating lens has a first light exit surface and a second light exit surface. The first light exit surface is recessed toward a point on the optical axis, and the second light exit surface extends outwardly from the periphery of the first light exit surface. The first light exit surface has a transmissive region and a total reflection region. When the position of a light source on the optical axis is defined as a starting point, the transmissive region transmits light that has been emitted from the starting point at a relatively small angle with respect to the optical axis, and the total reflection region totally reflects light that has been emitted from the starting point at a relatively large angle with respect to the optical axis. A reflective layer is formed on a bottom surface that surrounds a light entrance surface and faces oppositely to the light exit surface. The reflective layer reflects light that has been emitted from the light source, totally reflected repeatedly at the light exit surface, and then reached the bottom surface.

An illuminating lens has a light entrance surface and a light exit surface. The light exit surface has a first light exit surface recessed toward a point on an optical axis A and a second light exit surface extending outwardly from the periphery of the first light exit surface. The first light exit surface includes a transmissive region located in the center of the first light exit surface and a total reflection region located around the transmissive region. The transmissive region transmits light that has been emitted from a starting point Q, which is the position of a light source on the optical axis A, at a relatively small angle with respect to the optical axis A. The total reflection region totally reflects light that has been emitted from the starting point Q at a relatively large angle with respect to the optical axis A.

An illuminating lens includes a light entrance surface, a light exit surface, and a reversing surface. The light exit surface has a first light exit surface and a second light exit surface. The first light exit surface is recessed toward a point on the optical axis, and the second light exit surface extends outwardly from the periphery of the first light exit surface. The first light exit surface includes a transmissive region in the center thereof and a total reflection region on the peripheral side thereof. The reversing surface has a shape such that the light that has been emitted from the light source, totally reflected repeatedly at the light exit surface, and then reached the reversing surface is guided to the first light exit surface by total reflection.

An illuminating lens includes: a light entrance surface through which light emitted from a light source enters the lens; and a light exit surface through which the light that has entered the lens exits the lens. The light exit surface has: a concave portion intersecting the optical axis; and a convex portion provided around the concave portion to extend continuously from the concave portion. The light exit surface is formed in a shape such that a curvature C of micro-segments of the light exit surface in a cross section including the optical axis has a maximum value at a position outward from the midpoint of the convex portion.

Illuminating lens, and lighting device

A lighting device includes a light emitting element that emits a first colored light; a phosphor layer disposed on the light emitting element; and a lens part that is disposed so as to cover the light emitting element and the phosphor layer, and radiates light entering inside of the lens part so as to spread the light radially. The phosphor layer allows a part of the first colored light to transmit therethrough and converts another part of the first colored light into a second colored light having a wavelength longer than that of the first colored light. The lens part has: a base portion forming a light entrance surface through which the first colored light and the second colored light enter the lens part; and a diffraction portion forming a light exit surface through which the first colored light and the second colored light exit the lens part, the diffraction portion being configured so that a refracting power with respect to the second colored light is larger than a refracting power with respect to the first colored light.

Lighting device with phosphor layer and lens, and surface light source, and liquid-crystal display

A lens for illumination has a light entrance surface and a light exit surface. The light exit surface has a first light exit surface and a second light exit surface. The first light exit surface projects toward a vertex on the optical axis, and the second light exit surface extends outwardly from the periphery of the first light exit surface. The first light exit surface has a shape allowing light that has been emitted from a starting point, which is the position of a light source on the optical axis, at an angle of a specified value or more with respect to the optical axis and reached the first light exit surface to reach a surface to be irradiated by totally reflecting the emitted light at a first point thereon reached by the emitted light first and then refracting the totally reflected light at a second point thereon reached by the emitted light after being totally reflected. The second light exit surface has a shape allowing light that has been emitted from the starting point and reached the second light exit surface to reach the surface to be irradiated by refracting the emitted light at a point thereon reached by the emitted light.

Lens for illumination, lighting device, surface light source, and liquid-crystal display apparatus

Illuminating lens, and lighting device, surface light source, and liquid-crystal display apparatus each using the same

Disclosed is a plasma display panel wherein reduction of reflection and improvement in contrast and sharpness of image light can be attained at the same time. Specifically disclosed is a plasma display panel () comprising a front plate () and a back plate () arranged at a distance from each other, a partition wall () for dividing the discharge space formed between the front plate () and the back plate (), a phosphor layer () formed within a discharge cell () defined by the partition wall (), electrodes respectively arranged on the front plate () and the back plate () for producing a discharge within the discharge cell (), and a front filter () arranged on the viewer side of the front plate (). The front filter () has two resin layers () having different refractive indexes on the viewer side, and the viewer side surface of the front filter () and the interface between the two resin layers () respectively have fine recesses and projections.

Plasma display panel with front filter

A lens barrel includes a cam ring () that determines the position of a first lens frame () in the optical axis direction; a first correcting tube () that is made of a material having a coefficient of linear expansion different from that of the cam ring () and determines the position of the cam ring () in the optical axis direction; and a second correcting tube () that is made of a material having a coefficient of linear expansion different from that of a movable frame () and determines the position of a second lens frame () in the optical axis direction, wherein integrally with a change in the dimension of the first correcting tube () in the optical axis direction due to a temperature change, the cam ring () moves in the optical direction, and at the same time the first and second lenses () move in the optical axis direction; and integrally with a change in the dimension of the second correcting tube () in the optical axis direction due to the temperature change, the second lens () moves in the optical axis direction, and the distance between the first lens () and the second lens () changes.

Lens barrel

A projector system includes a first projection section projecting inputted image information onto a projection target, a laser pointer pointing a predetermined part of an image projected onto a screen, an image pick-up section picking up the image in a state pointed by the laser pointer, and a pointed position detecting section detecting the position of the part pointed by the laser pointer on the basis of the image information picked up by the image pick-up section. And a projection lens projects an image on the basis of the position of the part pointed by the laser pointer and detected by the pointed position detecting section and/or in correspondence to the image of the pointed part.

Growing community of inventors

Hyogo, Japan

Syunsuke Kimura