JP3495645B2 - Lamp adjustment device for liquid crystal projector and adjustment method using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector, and more particularly to a device for adjusting a mounting position of a lamp bulb and a reflector thereof and an adjusting method using the same.

[0002]

2. Description of the Related Art FIG. 3 shows an optical configuration from a lamp of a general liquid crystal projector to a screen.
Here, an optical configuration from a lamp to a screen of a general liquid crystal projector will be described with reference to FIG. In the drawings of this document, the chain double-dashed line represents the optical axis,
The arrow represents the luminous flux. The lamp 2 is a reflector 21
The light emitted from the lamp bulb 22 is efficiently and uniformly condensed by the integrating lenses 61 and 62, and is guided to the polarization converter 63. Polarization converter 63
Consists of a polarizing beam splitter and a λ / 2 retarder,
The two types of polarized light are changed to one type of polarized light (linearly polarized light) to improve the light use efficiency. The light emitted from the polarization conversion unit 63 has its luminous flux narrowed by the field lens 64 and the condenser lens 65, and passes through the aperture 66. Aperture 66
Is the holder of the liquid crystal light valve, so that the light passing through the aperture 66 means that the light passes through the liquid crystal light valve. Aperture 66, ie
The light flux that has passed through the liquid crystal light valve is enlarged by the projection lens 67 and projected on the screen 7.

Conventionally, a mercury lamp has been the mainstream of a lamp 2 for a liquid crystal projector, and a lamp bulb 22 serving as a light emitting portion.
And the reflector 21 are inseparably combined. The light emitted from the lamp bulb 22 is directly or reflected by the reflector 21 and passes through an optical system composed of the above-mentioned several kinds of lenses and the like, but is transmitted through the liquid crystal light valve on the way, and finally the screen 7 Leading to. Therefore, lamp 2
It is desired that the light emitted from the light source has a luminous flux symmetrical with respect to the optical axis when passing through the liquid crystal light valve, and the illuminance at the position of the screen 7 is maximum. Therefore, the lamp 2
When the light flux passes through the liquid crystal light valve, it becomes symmetrical with respect to the optical axis, and is adjusted so that the maximum illuminance that can be obtained at the position of the screen 7 is obtained. The fact that the light flux is symmetric with respect to the optical axis when passing through the liquid crystal light valve means that the maximum illuminance point on the screen 7 is at the center of the screen 7, that is, on the optical axis. In the process of assembling the lamp 2 as described above, a method of fixing the reflector 21 and finely moving the lamp bulb 22 to adjust the positional relationship between the two so that the illuminance on the screen 7 is maximized and then fixing the lamp 7 is usually performed. Is taken.

FIG. 2 shows a conventional adjusting method and apparatus. Figure 2
Here, 1 is a position fine movement mechanism in three directions of XYZ, 2 is a lamp including a reflector 21 and a lamp bulb 22, 5 is integrated lenses 61 and 62, a polarization conversion unit 63, a field lens 64, a condenser lens 65, and an aperture 66.
An optical path mechanism for adjustment in which the projection lens 67 is fixed to the housing 51 with the optical axes aligned at substantially the same intervals as in the actual liquid crystal projector, and 7 is a screen. The adjusting optical path mechanism 5 has a vertical movement mechanism 52 whose height can be changed.
Is provided.

A lamp 2 using the adjusting optical path mechanism 5
Was adjusted as follows. The vertical movement mechanism 52 of the adjusting optical path mechanism 5 is moved upward to align the optical axis of the lamp bulb 22 with the optical axis of the adjusting optical path mechanism 5. By doing so, the light emitted from the lamp 2 follows the same optical path as the actual projector, that is, reaches the screen 7 via the optical path of the adjusting optical path mechanism 5. Here, if the operator observes the screen 7, the light of the lamp 2 reaches the screen 7 in an appropriately enlarged state. Here, when the operator observes the screen 7, since the light of the lamp 2 is projected on the screen 7 in an appropriately enlarged state, it is easy to determine where on the screen 7 is the highest illuminance point. The position fine movement mechanism 1 is operated to adjust the position of the lamp bulb 22 so that this maximum illuminance point is located at the center of the screen 7, that is, on the optical axis. ((A) of Figure 2)

Next, the vertical moving mechanism 5 of the adjusting optical path mechanism 5
2 is lowered so that the light emitted from the lamp 2 is not blocked by the adjusting optical path mechanism 5 and the light of the lamp 2 reaches the screen 7 directly. In this way, the position fine movement mechanism 1 is operated to maximize the illuminance on the screen 7 and the lamp bulb 2
2 was adjusted ((B) of FIG. 2). Here, the adjustment optical path mechanism 5 is lowered so that the light of the lamp 2 directly reaches the screen 7. The reason is that the luminous flux is narrowed to increase the illuminance on the screen 7 and the difference in illuminance due to the adjustment of the lamp 2 is reduced. This is so that they can be observed. With this, in the lamp 2, it is adjusted that the luminous flux is symmetrical at the position of the aperture 66 and that the illuminance becomes maximum at the position of the screen 7.

[0007]

As described above, in the lamp of the liquid crystal projector, first, the center is brightest on the screen 7, and secondly, the position (distance) of the screen 7
The reflector 21 is adjusted so that the illuminance is maximized at
And the relative position of the lamp bulb 22 is fixed. By the way, when adjusting so that the center is brightest on the screen 7, it must be possible to observe where the highest illuminance point is on the screen 7. Fortunately, since the light of the lamp 2 is projected on the screen 7 in an appropriately magnified state, the maximum illuminance point can be found relatively easily.

Similarly, when the illuminance on the screen 7 is adjusted to be maximum, it is necessary to observe a change in the brightness of the screen 7 as the lamp bulb 22 slightly moves. However, the light from the lamp 2 reaches the screen 7 directly so that the light flux is not spread, and the light flux is narrowed to increase the illuminance on the screen 7. However, even so, in order to read the change in the illuminance of the screen 7 due to the slight movement of the position of the lamp bulb 22,
It requires a considerable amount of skill, and it is impossible to make adjustments over a long period of time by making heavy use of the eyes. When adjusting so that the center (on the optical axis) is brightest on the screen 7, the lamp 2
The light emitted from the screen must spread appropriately on the screen 7,
When the illuminance is adjusted to be maximized at the position (distance) of the screen 7, the light emitted from the lamp 2 needs to have a high illuminance on the screen 7.

The present invention has been made to solve the above-mentioned problems, and adjusts the lamp 2 so that the center (on the optical axis) of the screen 7 is brightest, and the lamp 2 is adjusted. Therefore, for the purpose of adjusting the illuminance on the screen 7 to the maximum, an object of the present invention is to provide a device suitable for it and an adjusting method utilizing this device.

[0010]

The present invention provides a screen 7
When adjusting so that the center (on the optical axis) is brightest at the top, it is possible when adjusting so that the light emitted from the lamp 2 spreads appropriately on the screen 7 and the illuminance on the screen 7 becomes maximum. I devised to make the illuminance as high as possible. That is, it consists of a position fine movement mechanism that mounts a lamp and adjusts the lamp bulb in the three directions of XYZ, an integral lens, a polarization conversion unit, and a field lens. The condensing mechanism, a condenser lens, an aperture, and a projection lens, and an adjusting magnifying mechanism in which the optical axes of these parts are aligned and aligned, and a screen. The adjusting condensing mechanism is moved upward. In the state, the optical axes of the three members including the lamp mounted on the adjusting enlargement mechanism and the position fine movement mechanism are aligned, and the light flux from the lamp is not blocked when the optical axis is moved downward. The lamp adjusting device for a liquid crystal projector is used.

The method of use is the run for the liquid crystal projector.
In flop adjuster, the adjusting condensing mechanism, while moving upward, the combined adjustment magnifying mechanism and the optical axis, to match the optical axis of the lamp bulb to the optical axis, fitted with a lamp in a position fine adjustment mechanism While the adjustment light converging mechanism remains in the upward state, the position fine movement mechanism is operated, the position of the lamp bulb is finely adjusted, and the illuminance at the screen position is adjusted to the maximum, and then, With the adjusting condensing mechanism moved downward, operate the position fine movement mechanism, and finely move the position of the lamp bulb, and adjust so that the position of the highest illuminance on the screen becomes the center of the screen. do it.

[0012]

FIG. 1 is a diagram showing one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a lamp 2 composed of a reflector 21 and a lamp bulb 22, and the lamp bulb 22 is fixed to XY.
It is a position fine movement mechanism that finely adjusts in three directions of Z. Although not shown, the fine position movement mechanism 1 also supplies power to the lamp bulb 22. 3 is an integrated lens 61, 6
2, the polarization converting unit 63 and the field lens 64 are aligned with the optical axis and arranged at an interval equivalent to that of an actual liquid crystal projector, and are fixed to the light collecting mechanism holder 31. This is an integrated lens 6
1, 62 to efficiently and uniformly collect light, and the polarization conversion unit 63 including a polarization beam splitter and a λ / 2 phase difference plate converts two types of polarized light into one type of polarized light (linearly polarized light) to improve light use efficiency. Improved and further field lens 64
The light flux is narrowed by. 4 is a condenser lens 6
5, the aperture 66 and the projection lens 67 are aligned with the optical axis and arranged at the same intervals as in an actual liquid crystal projector, and are fixed to the enlargement mechanism holder 41. Since the aperture 66 is a holder for the liquid crystal light valve, that the light that is focused by the condenser lens 65 passes through the aperture 66 means that the light passes through the liquid crystal light valve. The light flux that has passed through the aperture 66, that is, the liquid crystal light valve is enlarged by the projection lens 67 and is projected on the screen 7.

Next, the adjusting method will be described with reference to FIG. First, the illuminance on the screen 7 is adjusted to be maximum. The vertical moving mechanism 32 of the adjusting light collecting mechanism 3 is set to the upper side. The lamp 2 is attached to the position fine movement mechanism 1 by aligning the optical axis of the lamp bulb 22 with the optical axis of the adjusting light collecting mechanism 3. Then, the luminous flux is applied to the screen 7, and while observing the screen 7, the position fine movement mechanism 1 is operated so that the illuminance on the screen 7 is maximized, and the lamp bulb 22
The position of is adjusted ((A) of FIG. 1).

Next, adjustment is made so that the maximum illuminance point on the screen 7 is located at the center of the screen 7 (on the optical axis). This time, the vertical movement mechanism 32 of the adjusting light collecting mechanism 3
Set below. In this way, the light from the lamp 2 is directly guided to the adjusting magnifying mechanism 4 and magnified and projected on the screen 7. If the screen 7 is observed here, the highest illuminance point can be easily found, and the position fine movement mechanism 1 is moved so that the highest illuminance point moves to the center (on the optical axis) of the screen 7.
Is operated to adjust the position of the lamp bulb 22 ((B) of FIG. 1).

[0015]

According to the present invention, a position fine movement mechanism for mounting a lamp and adjusting a lamp bulb in three directions of XYZ,
It consists of an integrated lens, a polarization converter, and a field lens.The optical axis of each of these parts is aligned and aligned, and the adjusting condensing mechanism that can be moved up and down, the condenser lens, the aperture, and the projection lens are used. And an adjustment magnifying mechanism arranged side by side together with a screen, and in a state where the adjusting condensing mechanism is moved upward, the three elements including the lamps attached to the adjusting magnifying mechanism and the position fine movement mechanism are included. Use the lamp adjustment mechanism for the liquid crystal projector that is configured so that it does not block the light flux from the lamp when the person's optical axis is aligned and moved down. while moving in and manipulate the position fine adjustment mechanism, finely the position of the lamp bulb, illuminance on the position of the screen is adjusted to maximum, followed Adjusting condensing mechanism moves down, the light flux of the lamp directly leads to the adjustment expansion mechanism, by operating the position fine adjustment mechanism, finely the position of the lamp bulb, the position of the maximum illumination intensity screenshot on the screen Adjust so that it becomes the center of. That is, in the adjustment that requires high illuminance, the illuminance is high, and in the adjustment that requires the spread of light, spread the light.
Since the device and method according to the adjustment content are used, even an unskilled person can adjust efficiently without fatigue.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional adjustment method.

FIG. 3 is a diagram showing a general optical configuration from a lamp of a liquid crystal projector to a screen.

[Explanation of symbols] 1 Position fine movement mechanism 2 lamps 21 reflector 22 Lamp bulb 3 Focusing mechanism for adjustment 31 Focusing mechanism holder 32 Vertical movement mechanism of condensing mechanism 4 Enlarging mechanism for adjustment 41 Enlargement mechanism holder 5 Optical path mechanism for adjustment 51 Optical path mechanism holder 52 Vertical movement mechanism of optical path mechanism 61, 62 Integrated lens 63 Polarization converter 64 field lens 65 condenser lens 66 Aperture 67 projection lens 7 screen

Claims (2)

(57) [Claims] 1. A lamp is mounted and a lamp bulb is mounted in XYZ.
It consists of a position fine adjustment mechanism that adjusts in three directions, an integration lens, a polarization conversion unit consisting of a polarization beam splitter and a λ / 2 retardation plate, and a field lens. The optical axes of these components are aligned and movable up and down. It consists of an adjusting condensing mechanism, a condenser lens, an aperture, and a projection lens, and an adjusting magnifying mechanism in which the optical axes of these parts are aligned and a screen, and the adjusting condensing mechanism moves upward. In this state, the optical axes of the three members including the lamp mounted on the adjusting magnifying mechanism and the position fine movement mechanism are aligned, and the light flux from the lamp is not blocked when the lamp is moved downward. Characteristic LCD projector lamp adjustment device. 2. A liquid crystal projector lens according to claim 1.
In pump adjustment device, with moving the adjusting condensing mechanism above combined adjustment magnifying mechanism and the optical axis, to match the optical axis of the lamp bulb to the optical axis, fitted with a lamp in a position fine movement mechanism, The position fine movement mechanism is operated, the position of the lamp bulb is finely adjusted, and the illuminance at the position of the screen is adjusted to be maximum, and then the adjusting condensing mechanism is moved downward to change the luminous flux of the lamp. Leading to the adjusting enlargement mechanism, operating the position fine movement mechanism, finely moving the position of the lamp bulb, and adjusting so that the position of the highest illuminance on the screen becomes the center of the screen. Lamp adjustment method for LCD projectors.