Light projection device and video camera comprising light projection device

Abstract

The invention is applicable to the technical field of video shooting, and provides a light projection device and a video camera comprising the light projection device. The light projection device comprises a primary reflector and a visible light source arranged inside the primary reflector. The direction of the emergent light of the visible light source is provided with a secondary reflector. The secondary reflector and the primary reflector are coaxially arranged, of which the openings are oppositely arranged to each other. The light projection device also comprises a drive mechanism which can drive the visible light source and / or the secondary reflector to move along a central axis. Positions of the visible light source and / or the secondary reflector are adjustable so that the angle of the emergent light can change at any time to match the viewing angle of the video camera, and problems of the poor video shooting effect and the low utilization rate of light are avoided. Besides, with the arrangement of the secondary reflector, the visible light source is not necessarily installed on the front end of the primary reflector so that the visible light source, heat radiating components and heat conductive components do not resist the emergence of light. Therefore, a problem in a conventional light projection device that a light source and the heat radiating components affect the flux amount of the emergent light is solved, and thus the favorable video shooting quality is ensured.

Description

technical field [0001] The invention belongs to the field of imaging, and in particular relates to a light projection device and a video camera including the light projection device. Background technique [0002] A video camera is a device that collects dynamic or static image information of a subject. It can be used in various fields such as security, transportation, art, and daily shooting. The camera is usually equipped with a lighting system to emit light to the subject. The lighting After the light is reflected by the subject, it is captured by the imaging device of the camera, the light information is converted into an electrical signal, and the image of the subject is formed after corresponding data processing. Most of the light sources used by existing cameras have fixed light emission angles, and after the cameras leave the factory, their illumination angles are also fixed accordingly. However, when the angle of view of the camera is adjusted to be small in order t...

AI Technical Summary

Problems solved by technology

However, the light source 101 usually generates a large amount of heat, and a heat sink 103 must be installed on its back, and a heat conducting member 104 may also be provided to dissipate the heat. figure 1 , 2 The heat-conducting element 104 has the function of conducting heat and supporting the light source 101 at the same time. Both the heat-dissipating element 103 and the heat-conducting element 104 are located at the front end of the reflector 102, which will inevitably block the light from being emitted, and will waste part of the light, affecting the luminous flux and uniformity of the outgoing light.

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