Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Takumi Iba

Masatoshi Yamashita

Nami Nagamori

Takashi Kitamura

Hirohiko Ina

Nami Sawada

The present invention provides an image pickup lens with a large focal depth from the center to the outer part of an image plane formed on an image sensor and capable of maintaining its focal depth within a practical range and thus suppressing a decline in the resolution. An image pickup lensincludes, in order from the object side to the image plane side, an aperture stop, a first lensthat is a biconvex lens having positive power, a second lensthat is a meniscus lens having negative power and whose lens surface facing the object side is convex, a third lensthat is a meniscus lens having positive power and whose lens surface facing the object side is concave, and a fourth lensthat is a biconcave lens having negative power. The image pickup lensincludes a multifocal lens on the lens surface of the first lensfacing the object side. D and Ymax satisfy the following conditional expression ():0max&#x2266;0.1&#x2003;&#x2003;(1)where D is an absolute value of the distance between the multifocal lens surface and a surface of the aperture stop on the optical axis, and Ymax is the absolute value of the maximum image height on an image plane formed on the image sensor.

Image pickup lens, image pickup device using same, and portable apparatus equipped with the image pickup device

An image pickup lens compatible with small high-pixel image pickup elements (e.g., from CCD and CMOS image sensors having a pixel pitch of 1.75 &#x3bc;m and a pixel count of 5 mega pixels to CCD and CMOS image sensors having a pixel pitch of 1.4 &#x3bc;m and a pixel count of 8 mega pixels) is provided. An image pickup lensincludes, in order from an object side to an image surface side: an aperture stop, a first lenshaving positive power; a second lensthat is a meniscus lens having negative power and whose lens surface facing the image surface side is concave; a third lensthat is a meniscus lens having positive power and whose lens surface facing the image surface side is convex; and a fourth lensthat has negative power, whose lens surfaces are both aspherical and whose lens surface facing the image surface side is concave near the optical axis. A diffractive optical element is formed on one of the lens surfaces of the first lensor the second lens

Image pickup lens, image pickup device using same, and portable device equipped with image pickup device

An image pickup lens capable of providing an angle of view of up to 70&#xb0; or higher is provided. The image pickup lens can also be reduced in size and various aberrations associated with the lens can be corrected favorably, so that the image pickup lens is compatible with a high-pixel image pickup element. The image pickup lensincludes, in order from an object side to an image surface side: a first lensthat is a biconvex lens having positive power; a second lensthat has negative power and whose lens surface facing the image surface side is concave; a third lensthat is a meniscus lens having positive power and whose lens surface facing the image surface side is convex; and a fourth lensthat has negative power, whose lens surfaces are both aspherical and whose lens surface facing the image surface side is concave near an optical axis. The image pickup lenssatisfies the following conditional expressions (1) and (2), where f is the focal length of the overall optical system, Y' is the maximum image height, and TL is the overall length of the optical system:1.20&#x3c;&#x3c;1.35&#x2003;&#x2003;(1)&#x3c;2.0&#x2003;&#x2003;(2).

Image pickup lens and image pickup device using the same

The present invention provides an imaging lens composed of three lenses that can be made compact (downsized, thinned), allows a reduction in cost and can be made compatible with a high pixel imaging element having a megapixel or more incorporated in a small mobile product such as a mobile phone. The imaging lensincludes, in order from the object side to the image surface side: an aperture stop; a first lenshaving positive refractive power whose lens surface facing the image surface side is provided with a diffractive optical element; a second lenscomposed of a meniscus lens having positive refractive power whose lens surface facing the image surface side is convex; a third lenshaving negative refractive power. When f denotes the focal length of the entire optical system, f1 denotes the focal length of the first lens, f2 denotes the focal length of the second lens, f3 denotes the focal length of the third lensand &#x3c6;denotes refractive power of the diffractive optical element, conditional expressions (1) to (4) are satisfied:0.9&#x3c;1/&#x3c;1.3&#x2003;&#x2003;(1)0.7&#x3c;2/&#x3c;1.1&#x2003;&#x2003;(2)&#x2212;0.8&#x3c;3/&#x3c;&#x2212;0.6&#x2003;&#x2003;(3)&#x2212;0.3&#x3c;&#x3c;0.5&#x2003;&#x2003;(4).

Imaging lens and imaging device using the lens

The present invention provides an imaging lens composed of four lenses that can be made compact (downsized, thinned), allows a reduction in cost and is compatible with a high pixel imaging element having a megapixel or more incorporated in a small mobile product such as a mobile phone. The imaging lensincludes, in order from the object side to the image surface side: an aperture stop; a first lenshaving positive power; a second lenscomposed of a meniscus lens having negative power whose lens surface facing the image surface side is concave; a third lenscomposed of a meniscus lens having positive power whose lens surface facing the image surface side is convex, and a fourth lenshaving negative power whose lens surfaces are both aspheric and lens surface facing the image surface side is concave in the vicinity of the optical axis. A diffractive optical element is formed on one of the lens surfaces of the first lensor one of the lens surfaces of the second lens

Imaging lens and imaging device using the same

A photography lensincludes: an aperture stop; a first lenshaving positive refractive power, and at least one of the lens surfaces is aspherical; a second lenshaving negative refractive power, and at least one of the lens surfaces is aspherical; and a third lenshaving positive refractive power, and both lens surfaces are aspherical, arranged in that order from an object side to an image surface side. When f indicates the focal length of the entire optical system, f1 indicates the focal length of the first lens, f2 indicates the focal length of the second lens, r21 indicates the radius of curvature of the lens surface of the second lensfacing the object side, and n2 indicates the refractive index of the second lens, the following conditional expressions (1) to (3) are satisfied:0.8&#x3c;1/&#x3c;0.9&#x2003;&#x2003;(1)&#x2212;1.0&#x3c;2/&#x3c;0.7&#x2003;&#x2003;(2)&#x2212;1.0&#x3c;21/((2&#x2212;1)&#xb7;)&#x3c;&#x2212;0.7.&#x2003;&#x2003;(3)Thus, it is possible to provide a bright photography lens having high performance and an F number of 3.5 or less. The photography lens can be small and thin, and it can be manufactured at low cost, and it is compatible with a high pixel imaging element of a megapixel or more incorporated in a small mobile product such as a mobile phone.

Growing community of inventors

Kyoto, Japan

Takumi Iba