Sony Corporation

Other

Masaru Kawabata

Toshiharu Yanagida

Toru Udaka

Kazuhiro Tanaka

Keiichi Nito

Shinichiro Yamada

Hiroshi Imoto

Toshifumi Takaoka

Hideharu Miyagaki

Tooru Udaka

An electrical dimmer device and its driving method applicable to, for example, an image pickup unit and a display unit operate so that when a control signal for stop adjustment is changed from its current value of stop adjustment to a larger value, which occurs when the light transmissivity of a positive type liquid crystal is raised, or when the light transmissivity of a negative type liquid crystal is lowered, the control signal is temporarily varied to an intermediate value that is larger than the larger value. The energy of the varied larger value and a time during which that varied value is applied are determined in accordance with predetermined values. By doing so, it is possible to make a response speed when changing the light transmissivity extremely faster and thus attain a response time, of for example, one field period of time or less required for a stop mechanism of a video camera.

Electric dimming device and its driving method

A light control device and an imaging device suitable for the effective and stabilized driving of a Guest-Host type liquid crystal element. A light control device which is provided with a light controlling GH cell and a UV cut filter provided on the light incident side of the GH cell and which is therefore reduced significantly in the quantity of ultraviolet ray applied to the GH cell, thereby preventing the photodecomposition or photodegradation of materials constituting a liquid crystal layer in the GH cell; and an imaging device such as a CCD camera having this light control device disposed on the optical path thereof.

Guest-host liquid crystal element with removable polarizer

A light control device and an imaging device suitable for the effective and stabilized driving of a Guest-Host type liquid crystal element. A light control device () which is provided with a light controlling GH cell () and a UV cut filter () provided on the light incident side of the GH cell (), and which is therefore reduced significantly in the quantity of ultraviolet ray applied to the GH cell (), thereby preventing the photodecompositon or photodegradation of materials constituting a liquid crystal layer in the GH cell (); and an imaging device such as a CCD camera () having this light control device disposed on the optical path thereof.

A light control device includes a GH cell and a polarizer wherein a host material is made of a negative type liquid crystal whose dielectric anisotropy is negative and a guest material is made of a dichromatic positive type dye. The polarizer is provided at a side of light incident on the polarizer. A cell gap ranges from 2 &mgr;m to 4 &mgr;m, at least, in an effective light path.

Liquid crystal display having liquid crystal cell gap variation

A light control device comprises a liquid crystal cell and a pulse control unit or wherein when a transmittance of light transmitted from said liquid crystal element is changed from an actual light transmittance to an intended light transmittance, the pulse control unit is able to insert beforehand a drive pulse for control corresponding to a minimum light transmittance or a maximum light transmittance, at least, prior to application of a drive pulse corresponding to the intended light transmittance. A method of driving the light control device is also described wherein the light control device is driven by use of the drive pulse for control, along with a pickup device wherein the light control device is arranged in a light path of a pickup system.

Light control device, method for driving same and pickup device using the light control device

An optical apparatus having counter electrodes of ITO and working electrodes formed from a conductive paste prepared by dispersing silver or carbon conductive particles in a binder or a sintered material obtained by sintering silver or carbon conductive particles. The counter electrodes can be formed into a structure free of sharp edges which can cause a concentration of electric fields.

Growing community of inventors

Tokyo, Japan

Masaru Kawabata