Abstract:
A lens that covers the front side of an eye, includes: a high light-transmissive region including an eyepoint; and a low light-transmissive region surrounding the entire circumference of the high light-transmissive region, a light blocking ratio in the low light-transmissive region being higher than the light blocking ratio in the high light-transmissive region, wherein the low light-transmissive region has a region where the light blocking ratio changes toward the periphery.
Abstract:
The color display device includes a colored light generation unit for repetitively generating a plurality of colored lights in a time sequence with a predetermined frequency, and an image generation unit for processing said plurality of colored lights, so as to generate an image corresponding to each of the plurality of colored lights generated in a time sequence. The said predetermined frequency is 180 Hz or more.
Abstract:
A spectacle lens includes a first region which is located in at least part of a portion of a lens where a pivotal angle of an eyeball of a wearer ranges from 20 to 60 degrees and in which correcting astigmatism has priority over correcting average power based on prescribed power, and a second region which is formed inside the first region and in which correcting the average power has priority over correcting the astigmatism.
Abstract:
An apparatus for measuring a downward rotation amount of eyeball that measures a length from a distance-vision eye point to a near-vision eye point of a spectacle lens actually worn by a wearer and attached to a frame having an upper side portion and a lower side portion, includes: a line-of-sight position detecting unit that detects a position of a line of sight corresponding to the distance-vision eye point of the wearer and a position of a line of sight corresponding to the near-vision eye point; and a computing unit that computes a distance between the position of the distance-vision eye point and the position of the near-vision eye point detected by the line-of-sight position detecting unit, wherein the line-of-sight position detecting unit has an arm member that is rotatable at one end and positioned at a lateral position of an eyeball of the wearer, a front detecting mechanism that is disposed on the other end side of the arm member and detects a front position of the eyeball of the wearer, and an arm rotation angle detecting unit that detects a rotation angle of the arm member.
Abstract:
A semiconductor device comprises a protection circuit for protecting a semiconductor integrated circuit. The protection circuit includes a first terminal supplied with a first voltage, a second terminal supplied with a second voltage lower than the first voltage, a first thyristor arranged between the first terminal and the second terminal, and a trigger circuit operative to break a current path for trigger current flowing in the first gate of the first thyristor when the first voltage is applied to the first terminal, thereby disabling the first thyristor to become conductive, and operative to form the current path for trigger current when a voltage other than the first voltage is applied to the first terminal, thereby enabling the first thyristor to become conductive. The trigger circuit includes a third terminal for controlling operation of the trigger circuit in accordance with the voltage on the first terminal, a switching element connected between the first gate of the first thyristor and the second terminal and having a control terminal connected to the third terminal, and a resistor connected between the third terminal and the second terminal.