Projection equipment

A technology for projection equipment and lens caps, which is applied to instruments, projection devices, optics, etc., and can solve problems such as complex mechanical structures and high costs

Active Publication Date: 2009-08-05
LENOVO (BEIJING) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solution adopts automatic opening and closing of the lens cover, which has complex mechanical structure, high cost, and occupies a large volume. As far as the actual product is concerned, it is not popular due to other reasons such as cost.

Method used

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Examples

Experimental program
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Embodiment Construction

[0024] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals.

[0025] Glossary:

[0026] Power OK: It takes a certain amount of time from when the power supply is turned on to when the power supply outputs a stable voltage. In order to avoid abnormal voltage damage to the circuit, the power supply will first check whether the output voltage is normal. If it is normal, it will input a Power OK signal to the core components. The DDP controls the chip to enable it.

[0027] Lens prompt sound: When the prompt sound is issued because the lens cover is not opened, it is intended to remind the user to open the lens cover;

[0028] Trigger detection device: the contact point is designed on the edge of the lens, when the lens is opened, the contact point is automatically triggered. The other end of the contact is connected to the circuit. Whe...

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PUM

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Abstract

The present invention provides a projection equipment, which comprises a power detecting part used for detecting the power circuit of the projection equipment and producing a state signal of the power circuit to describe whether the state signal of the power circuit is in the normal state or not, a lens cap detecting part used for detecting the opening and closing state of the lens cap and producing a state signal of the lens cap which is used for describing whether the lens cap is in the opening state or not, and a control part which is connected with the power detecting part and the lens cap detecting part respectively to receive and judge the power state signal and the lens cap state signal in order to control the power of the projection equipment. The present invention can realize automatic detection of lens cap opening and closing and preventing damage to the projection equipment caused by the failure of opening the lens cap when the projector is power on.

Description

technical field [0001] The present invention relates to a projection device. Background technique [0002] At present, in the process of using the front-projection projector, due to unfavorable use and protection, the damage of the optical machine and the shortening of the service life occur frequently. For example, if you turn on the projection without opening the lens cover, the temperature inside the lens will be too high due to the unawareness for too long, which will cause damage to the optical machine. Since users have different levels of operation, how to convert the passive way of protecting the optical machine through the user's conscious operation into the active way of compulsive protection inside the projector itself has become a necessity. [0003] The universal lens cover can only be opened manually and has no protective function. A current existing solution is to use a sliding cover lens connected to a power button for protection. This solution adopts the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/00
Inventor 张玮
Owner LENOVO (BEIJING) LTD
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