Projection type image display device

An image display and projection technology, which is applied in projection devices, instruments, optics, etc., can solve the problems of movement delay and operability reduction, and achieve the effect of superior operability

Active Publication Date: 2020-01-17
MAXELL HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, there is a problem that when the direction of movement of the projection lens is reversed from the left to the right and from the top to the bottom, the X and Y sliders do not operate until the backlash is filled, and the movement operation is delayed. and reduce operability

Method used

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  • Projection type image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] figure 1 It is a figure which shows the whole structure of the projection type image display apparatus 10, and shows the internal structure except the case of an apparatus. Housed in the casing 1 are: as an optical system, an optical engine 2 that emits light from a light source and irradiates it to a liquid crystal panel as a display element to form an image; System 3. In addition, a power supply unit, a cooling unit, an image signal circuit, a control circuit, and the like, which are not shown in the figure, are accommodated.

[0039] figure 2 It is a figure which shows the whole structure of the optical engine 2. The optical engine 2 is composed of a light source unit 21 , a color separation optical system 22 , and a color synthesis optical system 23 . The light source unit 21 uses a light source such as an ultra-high pressure mercury lamp, and emits substantially white light. The color separation optical system 22 decomposes approximately white light into thre...

Embodiment 2

[0069] In Embodiment 2, a lens moving mechanism capable of easily correcting the optical axis inclination of the projection lens will be described. Such as Figure 6 As mentioned above, the initial correction of the tilt due to the position of the projection lens 31 and the lens' own weight can be performed by adjusting the insertion amounts of the four lens position correction bolts 411a to 411d. However, when the projection lens 31 is replaced with a heavier lens, it is necessary to further correct the inclination of the optical axis due to the weight of the lens. In the method of performing adjustment using the above-mentioned four correction bolts 411a to 411d, the adjustment work becomes complicated. Therefore, a mechanism for easily correcting the tilt of the optical axis described below is added.

[0070] Figure 17 It is a sectional view showing the optical axis correction mechanism of the projection lens. In this embodiment, the tilting of the lens moving mechanis...

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Abstract

A lens moving mechanism (32) of a projection type image display device (10) is provided with a horizontally movable base (60) that moves a projection lens (31) in a horizontal direction; and a vertically movable base (70) that moves the projection lens (31) in a vertical direction; and a horizontal drive actuator (61) and a vertical drive actuator (71) for driving the horizontally movable base (60) and the vertically movable base (70). The driving force from the horizontal drive actuator (61) and the driving force from the vertical drive actuator (71) are transmitted through a lead screw (671(751)) and two lead screw nuts (672, 672b (752, 752b)) engaged with the lead screw (671 (751)) respectively, so that the horizontal movable base and the vertical movable base are moved. An elastic member (672c (752c)) that applies pressure is mounted such that the two lead screw nuts move away from or get close to each other in the axial direction of the lead screw. By the structure, the backlashduring movement of a lens is reduced, and the delay in movement operation is eliminated.

Description

technical field [0001] The present invention relates to a projection type image display device, and more particularly to a lens moving mechanism for moving a projection lens. Background technique [0002] Projection-type image display devices such as liquid crystal projectors are devices that irradiate light emitted from a light source such as a mercury lamp to display elements such as liquid crystal panels, and enlarge and project the image formed by the display elements on a screen or the like through a projection lens. The optical system of the device is composed of an optical unit (hereinafter referred to as an optical engine) that irradiates light emitted from a light source to a liquid crystal panel to form an image, and a projection optical system that converts the image formed by the liquid crystal panel Magnified projection through projection lens. [0003] The projection optical system is provided with a lens moving mechanism that moves the projection lens in a di...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G03B21/14G02B7/02
CPCG03B21/147G03B21/142G03B21/14G02B27/0955G03B21/2033
Inventor石岛英纪乾真朗大岛浩松井信树
OwnerMAXELL HLDG LTD