JPH03271727A - Lens focusing direction adjusting device - Google Patents

Abstract

PURPOSE:To reduce the adjustment manhour by providing a stud on the outside periphery of a moving cylinder, providing a wheel gear on a part of its periphery, and providing an inclined groove for allowing the stud to pass through a fixed cylinder fixed to the frame of the device engaged like a concentric circle to a moving cylinder, and a worm gear engaged to the wheel gear. CONSTITUTION:On the periphery of a moving cylinder 1 provided with a lens block, wheel gears 1a, 1a are provided, and also, studs 1b, 1b extended in the outer periphery of the periphery are provided. Also, as for a fixed cylinder provided like a concentric circle, its inside diameters 2a, 2a are engaged to the outside diameters 1c, 1c of the moving cylinder 1, and moreover, a worm gear 3 engaged with the wheel gears 1a, 1a and inclined grooves 2b, 2b where the studs 1b, 1b are allowed to pass through are provided. In such a manner, by aligning the tip of a motor-driven type driver with a pit part 3a of the worm gear 3 and only depressing the button, while looking at a test pattern projected on a screen in a worker's easily visible position, the lens focusing direction can be adjusted.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a focus direction adjustment device for a lens block that accurately enlarges and projects an image output from a cathode ray tube of a projection television onto a screen, and adjustment in the manufacturing process thereof. Regarding equipment.

[Prior Art] Rear projection televisions have excellent features such as being able to project large-screen images onto a screen at low cost. On the other hand, compared to small-screen TVs that use cathode ray tubes, the adjustment process during the manufacturing process is time-consuming.

Focus adjustment of the lens block, which is particularly time-consuming in the adjustment process, will be described below with reference to the drawings.

As shown in FIGS. 4 to 6, a worker stands in front of the device and inserts both hands into the device through holes 7a and 7a made at the lower left and right sides of the screen 7, and then inserts a movable tube equipped with a lens as shown in FIG. Loosen the screw 8 fixed to the machine with a screwdriver 9 or the like, rotate the movable barrel 1 manually, and the stud 1b that penetrates the inclined groove 2b of the fixed barrel 2 rotates to move the movable barrel 1 in the focus direction. 5 (!As shown in I, the operator is located at the bottom of the screen, focuses on the test pattern while looking at it, and at that position tightens the screw provided on the movable tube 1 again to move the movable tube 1 to the fixed tube 2. It was fixed and adjusted.

[Problems to be Solved by the Invention] As described above, in the above conventional technology, the test pattern is viewed from a position where it is difficult to see the screen, the screw of the movable cylinder equipped with the lens in the device is loosened with a screwdriver, and further, The movable tube was manually rotated, moved in the focus direction by the action of the stud and the inclined groove, focused, and then tightened the screw again to fix the movable tube to the fixed tube, making it difficult to adjust the focus direction. It is time consuming and
The test pattern will be inaccurate because it will be viewed from the lower part where it is difficult to see! There was a problem in that it took more time for the adjustment.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lens focus direction adjustment device that can be adjusted at a position on the screen that is easy to view and that does not take much time to adjust.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a stud on the outer periphery of a movable tube equipped with a lens, and a wheel gear is provided on a part of the periphery of the stud so as to be concentric with the movable tube. A fixed cylinder fixed to the frame of the device to be engaged is provided with an inclined groove through which the stud passes and a worm gear which engages with the wheel gear.

[Operation] When the operator rotates the worm gear using an electric screwdriver or the like at any position in front of the screen, the movable barrel is simultaneously moved in the focus direction by the action of the inclined grooves provided on the stud and fixed barrel. You can focus on it. In addition, since the movable tube and the fixed tube are engaged by a worm wheel gear, the movable tube is locked to the fixed tube, so the GUI can be operated electrically while watching the screen from any position. This can be done by simply pressing a button on the driver.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 to 3. Figure 1, 2nd rl! In J, 1 is a movable cylinder equipped with a lens block, and wheel gears 1a and 1 are arranged around it.
a stud lb which is provided with a and extends outward in the circumferential direction;
It is equipped with lb.

On the other hand, the fixed cylinder 2 provided concentrically has an inner diameter 2a,
2a and the outer diameters 1c, lc of the movable cylinder 1, and the worm gear 3 and the studs lb, which are engaged with the wheel gears 1a, la, are provided with inclined grooves 2b, 2b that pass through them,
It is fixed to the frame portion 4 of the device with screws 5 or the like.

According to the present invention, in the apparatus having the above configuration, as shown in FIG. Alternatively, the reworm gear 3 is rotated by bringing the tip 6a of the driver 6 into contact with the driver bit portion 3a having a -head groove shape and pressing a button on the driver 6 to rotate the wheel gear 1a.

1a, and at the same time, the studs provided on the movable barrel 1 pass through the inclined grooves 2b, 2b provided in the fixed barrel 2, so the movable barrel 1 is moved in a direction perpendicular to the fixed barrel (as indicated by the arrow in the figure). (b) direction), and as a result move in the lens focus adjustment direction, adjust the focus in the IIIL lens focus direction while looking at the screen 6, and as it is, the movable barrel 1 and the fixed barrel are connected to each other due to the engagement of the worm wheel gear. , which allows you to easily adjust the focus direction.

[Effects of the Invention] According to the present invention, the lens focus direction can be adjusted by simply aligning the tip of the electric screwdriver with the bit part of the worm gear and pressing a button while watching the test pattern projected on the screen from a position that is easily visible to the operator. As a result, the number of adjustment steps can be greatly reduced, and the adjustment values can be made accurately.

[Brief explanation of drawings]

Fig. 1 is a plan view of a lens holding cylinder fixing cylinder showing an embodiment of the present invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 is a focus adjustment work and the entire device showing an embodiment of the present invention. side view,
FIG. 4 is a diagram showing the focus adjustment work of the lens block, FIG. 5 is a side view of the conventional focus adjustment work and the entire apparatus, and FIG. 6 is a side view of the lens block. Explanation of symbols 1...Lens holding tube, 1a...Wheel gear, 1b
...Stud, 1c...Outer diameter, 2...Fixed tube, 2
a... Inner diameter, 2b... Inclined groove, 3... Worm gear, 3a... Pit part, 4... Frame part of the device,
5... Screw, 6... Electric screwdriver, 7... Screen, 7a... Hole in screen, 8... Screw. Tsuta 10

Claims (1)

[Claims] 1. In a focus direction adjustment device for a lens block that enlarges and projects an image output from a cathode ray tube of a projection television, a pair of studs extending outward from the center is provided on the outer periphery of a movable tube that holds the lens block. and a movable cylinder having a wheel gear that engages with a worm gear on its outer periphery, a pair of inclined grooves located concentrically with the movable cylinder and passing through the stud, and a tooth surface of the wheel gear for power transmission. 1. A lens focus direction adjusting device comprising: a fixed tube equipped with the worm gear engaged in relation to each other and fixed to a frame portion of the device. 2. In claim 1, the worm gear and the wheel gear rotate when the worm gear is rotated, the wheel gear rotates, and at the same time, the stud of the movable barrel rotates according to the inclined groove of the fixed barrel, so that the center of the movable barrel is rotated. The fixed cylinder is moved in the axial direction;
A lens focus characterized in that the dimensions and shapes of the worm gear and the wheel gear are selected so that even if an attempt is made to directly rotate the moving axis, the tooth surface of the worm gear will not move as it gets wedged in the gear of the wheel gear. Orientation device.