Light emission device and distance measurement device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsHirotaka Ueno, Kiyoshi Morimoto, Keisuke Kojima
Life of this patent
Estimating the term…
Abstract
A light emission device includes: a laser light source; an electric storage element for supplying a drive current to the laser light source; a plurality of switch elements connected in series to the laser light source; and an electrical element placed at least between a ground and an input part, for a switch opening/closing signal, of the switch element to which another one of the switch elements is connected on a downstream side, and configured to guide noise having a high level exceeding a voltage level of the switch opening/closing signal, to the ground.
Claims16
A light emission device comprising:
- a laser light source;
- an electric storage element for supplying a drive current to the laser light source;
- a plurality of switch elements connected in series to the laser light source;
- and
- an electrical element placed at least between a ground and an input part, for a switch opening/closing signal, of the switch element to which another one of the switch elements is connected on a downstream side, and configured to guide noise having a high level exceeding a voltage level of the switch opening/closing signal, to the ground.
A distance measurement device comprising:
- a light emission device;
- a projection optical system configured to project pulsed light emitted from the light emission device, to a target region;
- and
- a light receiver configured to receive reflected light, from an object, of the pulsed light, wherein
- the light emission device includes
- a laser light source,
- an electric storage element for supplying a drive current to the laser light source,
- a plurality of switch elements connected in series to the laser light source, and
- an electrical element placed at least between a ground and an input part, for a switch opening/closing signal, of the switch element to which another one of the switch elements is connected on a downstream side, and configured to guide noise having a high level exceeding a voltage level of the switch opening/closing signal, to the ground.
Dependencies are inferred from the claim text.