JPS5848886B2 - Eishiyakino lens adjustment touch - Google Patents

Description

Detailed Description of the Invention The present invention uses a zoom lens as a projection lens, and by inserting and removing a light reflecting member in the projection optical path, projection can be performed on a self-contained see-through screen and a remote screen located away from the projector. In a lens adjustment device for a projector with a self-contained screen that can selectively perform projection on the self-contained screen, when projecting onto the self-contained screen, the light reflected on the self-contained screen is inserted and removed in the projection optical path. In addition to automatically adjusting the sharpness and sharpness of the image, it is also possible to independently focus and zoom whether projecting to a remote screen or a self-contained screen. This invention relates to a lens adjustment device for a projector.

For projectors with a self-contained screen that can selectively project on the self-contained screen and on a remote screen, a mirror or prism that is a removable light reflecting member is installed in the projection optical path. For example, a light reflecting member that is provided and inserted into the projection optical path when projecting onto a self-contained screen is removed from the projection optical path when projecting onto a remote screen, so that direct projection is performed.

In a self-contained screen projector, when switching the projection optical path between projection by the self-contained screen and projection to the remote screen, the light reflecting member is inserted into and removed from the projection optical path, and the projection optical path is converted. There is a camera that automatically adjusts the projection angle to a remote screen at a fixed distance from the film surface by inserting and removing the lens.

However, even in this type of projector, focusing must be performed each time the projection optical path is switched, even when projecting onto a self-contained screen located at a fixed distance.

In other words, in conventional projectors with built-in screens, when switching the projection optical path, at least two operations are essential: switching the light reflecting member and focusing the projection lens, and furthermore, the projection distance is kept constant to maintain the image size. In addition to the above two operations, zooming of the projection lens is also essential in a projector that uses a zoom lens as the projection lens so that the projection lens can be changed arbitrarily while maintaining the same.

The present invention has such a zoom lens as a projection lens, and in a projector capable of selectively switching the projection optical path to a self-contained screen and a remote screen, the light reflecting member can be switched and the projection lens can be selectively switched to a self-contained screen and a remote screen. Focusing and zooming to the screen are performed, and the differences between focusing and zooming of the projection lens are independent of each other and related to the light reflecting member, both when projecting onto a self-contained screen and when projecting onto a remote screen. The aim is to provide a projector that can be used without any problems.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an example of the optical system of a self-contained screen projector, in which an image on a film 1 is illuminated by light emitted from a projection lens 2, and a remote screen (not shown) located in the projection optical path OR direction is illuminated by the projection lens 3. Alternatively, it is projected onto any of the self-contained screens 4 located in the direction of the projection optical path OS.

A light reflecting member 5 inserted obliquely into the projection optical path OR and OS
can be selectively switched between the projection position on the self-contained screen 4 shown by the solid line and the projection position on the small remote screen shown by the chain line, and in the solid line position, the projection optical path is perpendicular to the optical axis of the projection lens 3. The projection light reaches the screen 4 via mirrors 6, 7 and 8.

The above configuration is the same as that of a known self-contained screen projector, and of course there are film feeding mechanisms, operating mechanisms, etc.
Although the projector includes essential components for a projector, a description thereof will be omitted because they are not directly related to the gist of the present invention.

In FIGS. 2 and 3, the projection lens 3 is a zoom lens having, for example, three optical lens groups, one of which is movable with respect to the other two groups during zooming,
Focusing can be achieved by moving the entire three optical lens groups mentioned above without changing their relative positions.
Zooming is performed by moving the movable group relative to the other two groups.

This zooming is performed using the zoom ring 9 of the projection lens 3.
This can be done by rotating the

The projection lens 3 is inserted into a lens holder 11 fixed to the projector body 10 with a suitable fit in a sleeve 12 that is slidably guided in the direction of the optical axis of the projection lens 3. A slot 13 is provided in the circumferential direction.

Furthermore, this slot 13 houses an eccentric pin 15 provided at an eccentric position of a focusing member 14 rotatably supported by the lens holder 11 and perpendicular to the optical axis of the projection lens 3.

The force focusing member 14 has a fixed force focusing knob 17 at one end protruding outside the projector housing 16, and rotation of the force focusing knob 17 causes the eccentric pin 15 to rotate around the rotation axis of the focusing member 14. As a result, the sleeve 12 moves along with the projection lens 3 in the direction of its optical axis, and the projection lens 3 is focused.

A frame 18 that rotatably supports the focusing member 14 is attached to the projector body 10 by a stand 47.
4, a zooming member 19 is movably supported.

This zooming member 19 has a fixed zooming knob 20 at one end protruding outside the projector housing 16, a fixed booley 21 as a second movable member in the middle, and a collar for fixing the axial position of the zooming member 19 at the other end. It has 22.

A pulley 21, which is a second movable member, is drivingly connected to the zooming ring 9 by a wire 24 that is stretched through a guide roller 23 that is attached to the frame 18 on a rotating shaft.

Therefore, by rotating the zooming knob 20, the projection lens 3 can be zoomed.

The focus sink member 14 has a focus knob 1.
A switching knob 27 is provided, which is loosely fitted coaxially with the focusing member 14 and is pressed in a direction protruding outward from the projector housing 16 by a spring 26 inserted between the focusing member 14 (and a fixed pin 25). Switching knob 27 is cam 2
8 and is integrally connected with a gear 30 having a pin 29.

Therefore, push the switching knob 27 from outside the housing 16 against the pressure of the spring 26 to move the pin 29 into the pin 25.
By engaging and rotating the focusing member 14, the focusing member 14 rotates, and the projection lens 3 can be focused.

The gear 30 is loosely fitted into the zooming member 19 and meshes with a gear 32, which is a first movable member, whose axial position is determined by a spacer 31.

The first movable member gear 32 has a pin 33, while the second movable member 21 has a pin 34.
These pins 33 and pins 34 move the boley 21, which is a second movable member, relative to the rotational movement of the gear 32, which is a first movable member.
In order to maintain a constant difference in the amount of movement, the relative positions are maintained as described below.

In FIG. 4, the focusing member 14 and the zooming member 19 are located at positions closest to the film in the focusing movement range of the projection lens 3, respectively;
That is, it is assumed that the projection distance is at the position corresponding to the longest distance, and the zooming range is at the original position O corresponding to the telephoto side, and the four-force sink knob 17 corresponds to the entire movement range for focusing the projection lens 3. It is assumed that the total amount of rotation of the zoom knob 20 corresponding to the entire zooming range is 70 degrees.

The switching knob 27 can be rotated through 320 degrees, the same as the full rotation amount of the focusing knob 17, and is prevented from rotating beyond 320 degrees by a stop device (not shown).

Further, when the switch is switched to projecting onto a remote screen, the switching knob 27 is at the original position O shown in FIG. 4, and maintains this original position regardless of the position of the focusing member 14.

A pin 33 of a gear 32 which is a first movable member and a pin 34 of a booley 21 which is a second movable member are provided coaxially with the zooming member 19. When the gear 30 is in the original position O, the pin 34 is connected to the pin 33. Therefore, when the switching knob 27 is pushed around and rotated 320 degrees, the focusing member 14 rotates 320 degrees.
20 degrees, the gear 32 first idles 150 degrees, and then the pin 33
The engagement of the pin 34 causes the boley 21 to rotate 170k.

When the gear 30 is in the original position O and the switching knob 27 is not pushed in, the pins 33 and 34 are also in the original position, and the focusing member 14 can rotate in its entire rotation range, and the zooming member 19 can also rotate through the entire rotation range.

As described above, at any position within the entire movement range of the focusing member 14 and the zooming member 19, by pushing and turning the switching knob 27, the focusing member 14 and the zooming member 19 move to the shortest projection distance and the wide side of the zooming range, respectively. It can be seen that the image size and sharpness adjustments relative to the self-contained screen 4 (FIG. 1) are carried out by being rotated into corresponding positions.

2 and 3 again, the tip of the frame 18 is provided with a screw 35 at a position inclined at an angle of 45 degrees with respect to the optical axis of the projection lens 3 (solid line position) and a position outside the projection light flux (
A rotary plate 36 is provided which has two positions (the position indicated by the chain line) and has the light reflecting member 5 attached thereto.

This rotating plate 36 is reversed between the above two positions by a click spring 39 that is applied between a pin 37 fixed to the frame 18 and a pin 38 fixed to the rotating plate 36.

The other end 40 of the pin 38 of the pivot plate 36 enters a fork-shaped portion 44 of a connecting plate 43 that is slidably guided by a slot 42 in a stud 41 attached to the frame 18 and in the zooming member 19.

Further, the connecting plate 43 is engaged with a cam 28 integrated with the switching knob 27 through a fork-shaped portion 45 at the other end.

This cam 28 moves the connecting plate 43 in the direction of the optical axis of the projection lens 3 by rotating the switching knob 27.
6. Therefore, when the switching knob 27 or the gear 30 is in its original position, the light reflecting member 5 is positioned outside the projection light beam, and when the switching knob 27 is rotated 320 degrees from its original position, it is positioned relative to the optical axis of the projection lens 3. Rotate it to hold it in the 45th position.

Next, a method of using the apparatus of the present invention will be explained.

In FIGS. 2 and 3, the light reflecting member 5 is inclined at 45 degrees with respect to the optical axis of the projection lens 3, and the projection optical path is directed to the light reflecting member in order to project onto the self-contained screen IJ 1 4 (see FIG. 1). 5 shows a state in which the projection lens 3 is turned at right angles to the optical axis.

In this state, the projection lens 3 is adjusted for focusing and zooming so that the film image is projected onto the self-contained screen 4 (FIG. 1) sharply and in a size that matches the projection area of the self-contained screen 4. ing.

When projecting onto a remote screen, turn the switching knob 27 counterclockwise.

This operation causes the gear 30 to move counterclockwise as well.
2 rotates clockwise, but when projecting onto a remote screen, the distance between the film surface and the remote screen changes depending on the installation position of the projector or screen, making it impossible to unambiguously determine the adjustment state of the projection lens. So,
Whether the switching knob 27 is pushed or simply rotated, the gears 30 and 32 simply rotate and return to their original positions (Fig. 4), and the pin 29, pin 25, and pin 3 are rotated.
3 and 34 are disengaged, so that the focusing member 14 and the zooming member 19 are adapted for projection onto the self-contained screen 4 (FIG. 1), as indicated by S and S' in FIG. Only the light reflecting member 5 is moved to a position outside the optical path shown by a chain line in FIG. 2, and projection onto a remote screen installed in front of the optical axis of the projection lens 3 becomes possible.

In this state, the focusing knob 17 and the zooming knob 20 can be rotated independently over the entire rotation range, and the projection lens 3 can be focused and zoomed in accordance with the projection distance.

From projection to remote screen to self-contained screen 4
(Figure 1) When switching to projection, turn switch knob 27 to 32.
By pushing and turning 0 degrees, the pin 29 first engages with the pin 25, the force-singing member 14 rotates, and at the same time the gear 3
0 rotates, but the gear 32 also rotates, and the pin 33 is rotated 150 degrees from the original position.
34 engages, the gear 32 and the booley 21 rotate further 170 degrees together, and the self-contained screen 4 (FIG. 1) is rotated again.
Focusing and zooming are performed, and at the same time, the light reflecting member 5 is moved toward the projection lens 3 by the movement of the connecting plate 43.
It is inserted at a position 4r apart from the optical axis.

In this case, if you wish to perform focusing independently due to differences in film bases, etc., you can perform focusing independently by adjusting the force focusing knob 17. On the other hand, when it is desired to reduce and project the image, lζ is also capable of independent zooming for that purpose.

Note that when switching from remote screen projection to self-contained screen projection, even if the focusing member 14 and zooming member 19 are in the middle of their rotation ranges during remote screen projection, the switching knob 27
Since it is in the original position, it can be easily understood from FIG. 4 that the pins 25 and 29 engage with each other midway through their rotation, and the switch to the self-contained screen is performed in the same way as described above.

As explained above, according to the apparatus of the present invention, in a projector with a self-contained screen that can switch between projection on a self-contained screen and projection on a remote screen, the projection light path can be changed by switching the projection onto the self-contained screen. switching,
Adjustments of the optical system such as focusing and zooming can be made instantaneously with a single operation, and individual adjustments of focusing and zooming can be made as desired.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a projection optical system of a self-contained screen projector, FIGS. 2 and 3 are explanatory diagrams of main parts of a lens adjustment device for a projector according to the present invention, and FIG. 4 is an illustration of an apparatus according to the present invention. FIG. 3...Zoom lens, 4...Self-contained screen, 5...Light reflecting member, 9...Zooming ring, 14...Focusing Member, 19... Zooming member, 21...
Second movable member (pulley), 25... pin (of focusing member 14), 27... switching knob, 28... cam (integrated with switching knob 27) , 29... (of gear 30) pin, 30...
...Gear (integrated with switching knob 27), 32...
. . . first movable member (a gear that is loosely fitted into the zooming member 14 and meshes with the gear 30), 33 . . . pin (of the first movable member 32), 34 . . . 2) pin of the movable member 21, 36... (the light reflecting member 5 is provided) rotating plate, 38... (the rotating plate 36) pin,
43... Connection plate.

Claims (1)

[Claims] 1 A zoom lens is provided as the projection lens 3, and by inserting and removing the light reflecting member 5 into the projection optical path, it is possible to select between projection onto the self-contained see-through screen 4 and projection onto a remote screen located away from the projector. A focusing member 14 has an eccentric pin 15 inserted into a slot 13 of a sleeve 12 of the projection lens 3 at one end and a rotation knob at the other end. and the focusing member 14
The spring 26 inserted between the pin 25 fixed to the
A switching knob 27 having a cam 28 which is pressed in a direction protruding outward from the projector housing 16 is loosely fitted coaxially with the force-singing knob, and a gear 30 having a pin 29 is integrally coupled with the switching knob 27. It is rotatably supported by the frame 18 of the projector in parallel with the focusing member 14, has a zooming knob 20 at one end, a collar 22 for fixing the position in the axial direction at the other end, and a collar 22 in the middle part. A gear 32 that meshes steadily with the gear 30 and has a pin 33 implanted therein, and the pin 3
A zooming member 17 is provided, each having a pin 34 engaging with the zooming member 19 and a fixed booley 21 drivingly connected by a wire 24 to the zooming ring 9 of the projection lens 3 via a roller 23; The fork-shaped part 44 at one end of the fork-shaped part 44 has two positions, one inside the projection light beam and the other outside the projection light beam, tilted at an angle of 45 with respect to the optical axis by a click spring.
The rotating plate 3 has been reversely moved to the position and the light reflecting member 5 has been attached.
6, and a fork-shaped portion 45 at the other end.
By providing a connecting plate 43 that engages with the cam 28 that is integrated with the switching knob 27, the switching knob 27 is pushed in from the outside of the housing 16 against the pressure of the spring 26, and the pin 29 is pushed into the pin 25. By engaging the focusing member 14, the projection lens 3 is focused by rotating the focusing member 14 and moving in the optical axis direction, while the gear 30, the gear 32, and the booley 21 are engaged with each other.
In response to the rotation of the zooming ring 9 via the roller 23 and the rotation of the gear 32, the pin 33 and the pin 34 are connected to the projection optical path by the switching knob 27 of the light reflecting member 5. The projector is characterized in that the amount of movement of the lens in the zooming area and the focusing area of the projection lens 3 is regulated by positioning the projection lens 3 relative to each other so as to maintain a predetermined path difference in the amount of rotation during insertion and removal. lens adjustment device.