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Image projection apparatus

An image projection and image technology, which is applied to the image reproducer of the projection device, projection device, photography, etc., can solve the problem that it is difficult to correctly judge the state of the components of the projection optical system.

Active Publication Date: 2021-05-28
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to correctly judge the state of the elements of the projection optical system

Method used

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  • Image projection apparatus
  • Image projection apparatus
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Examples

Experimental program
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Embodiment Construction

[0020] Embodiments of the image projection device will be described below with reference to the drawings.

[0021]

[0022] figure 1 It is a perspective view of the projection state of the projector 1 of the embodiment. figure 2 It is a perspective view of the optical engine in the projector 1 of the embodiment. image 3 It is a perspective view of the illumination optical unit in the projector 1 of the embodiment.

[0023] First, the projector 1 is an example of an image projection device such as figure 1 As shown, it has an injection window 3 and an external interface (external I / F) 9 . In addition, an optical engine for generating projected images is also provided inside the projector 1 . The projector 1 generates a projected image with an optical engine based on image data sent from a personal computer device (computer) or a digital camera connected to the external I / F9, such as figure 1 As shown, an image P is projected from the exit window 3 onto the screen S. f...

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Abstract

The invention aims to provide an image projection device capable of correctly determining the state of a projection optical system element. The image projection device performs image projection through a projection optical system, and is characterized by comprising a light detection part used for detecting the light amount of light before the light enters the projection optical system and the light amount of light passing through the projection optical system; a comparison unit for comparing the amount of light detected by the light detection unit before entering the projection optical system with the amount of light passing through the projection optical system; and a notification control unit for controlling a notification unit to perform a predetermined notification operation when the difference between the amount of light before entering the projection optical system and the amount of light passing through the projection optical system is equal to or greater than a predetermined value.

Description

technical field [0001] The present invention relates to image projection devices. Background technique [0002] DLP (Digital Light Processing) projection devices are well known nowadays. The DLP projection device irradiates the light emitted from the light source onto the color wheel. The color wheel is formed as a variety of optical filters that can transmit specific wavelengths along the circumference of the disc, and is driven to rotate at high speed on the optical path of the light emitted by the light source. The light passing through the optical filters of such a color wheel illuminates the light modulating element through the optical channel. The light modulation element forms an image for projection based on the light transmitted through the respective optical filters of the color wheel. The image for projection is projected onto a screen or the like via a projection optical system. [0003] For example, a DMD (Digital Micromirror Device) is used as the light mod...

Claims

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Application Information

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IPC IPC(8): H04N9/31G03B21/20
CPCH04N9/31G03B21/2066G02B5/208G03B21/008G03B21/28G03B33/08G03B43/00G02B26/008
Inventor 松山敏伸
Owner RICOH KK