Light projection device
US10895373B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 2018 |
| Grant date | Jan 19, 2021 |
| Priority date | — |
| Expiry date | Dec 20, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/3574
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light projection device includes a tubular casing having a light-emitting part at one tube end; a light source configured with a light-emitting diode; and a light amount control mechanism positioned between the light source and the light-emitting part. The light amount control mechanism includes a rotating body, an operating part attached to the rotating body such as to allow for rotary operation of the rotating body from outside the casing, a variable resistor, and a link mechanism operably connecting the rotating body and the variable resistor such that a forward movement of the rotating body causes a movable part of the variable resistor to move in a direction in which the amount of current is increased and such that a backward movement of the rotating body causes the movable part of the variable resistor to move in a direction in which the amount of current is decreased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.