JP3107314B2 - projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector capable of so-called shift and tilt.

[0002]

2. Description of the Related Art For example, the inner wall of a concourse at a railway station or the white outer wall of a night building is used as a screen.
An advertisement method of projecting a translucent image for advertisement by a projector has been proposed and implemented.

In this case, naturally, a large projector having a light source having a large wattage is used. However, in order to enhance a projection effect, a projector which is installed at a position higher than a person's head is relatively lower. Installed in

Therefore, the projector looks up at the screen. In other words, the optical axis of the lens is oblique to the normal set on the screen.

[0005]

However, usually, the lens of the projector is arranged so that its optical axis coincides with the normal established at the center of the transparencies mounted on the projector.

For this reason, the projected image on the screen is a so-called downward constriction in which the upper part is large and the lower part is small, and the optical path length is different between the upper part and the lower part of the projected image. There is an inconvenience that you cannot do it.

[0007] As described above, the distortion of the projected image and the darkness of the projection surface are obstacles to the advertisement by such a projector, and the advantages of the sharpness of the image and the ease of conversion cannot be fully utilized.

An object of the present invention is to provide a projector capable of shifting and tilting, thereby solving the above-mentioned disadvantages.

[0009]

In order to achieve the above object, the present invention is directed to a holder for holding a transparent positive image, a projection lens disposed in front of the holder, and a rear side of the holder. And a light source disposed in
A vertical gate-shaped guide rail is fixed to the front of the holder, slidably engaged with this guide rail, and substantially parallel to the transparency.
Attach the projection lens to the lens board and
Between the top edge of the card and the top of the guide rail, and the lens
Bellows-like shielding between the lower edge of the board and the lower frame of the guide rail
A light body is stretched, and a horizontal engaging pin is protruded from a side edge of the lens board. The protruding position of the engaging pin includes an axis including substantially the center of the exit pupil of the projection lens. It is set so that it is in a plane that is almost parallel to the transparency, while a horizontal rotation axis that is in the plane that contains the transparency is set near the holder so that it can rotate around this rotation axis. A guided body is provided and formed at the front of the body along its length.
The guide slit is slidably engaged with the engagement pin , and the light source box is supported at the rear end of the control body.
A plane including the axis of the engagement pin and the rotation axis of the control body is substantially parallel to a plane including a horizontal line passing substantially through the center of the exit pupil of the projection lens and a horizontal line passing through the center of the transparent image. The position of the rotation axis of the control body is set as described above, and the optical axis of the light source box is substantially aligned with the line connecting the center of the transparent image and the center of the exit pupil of the projection lens. And

According to a second aspect of the present invention, there is provided an image processing apparatus comprising: a holder for holding a transparent positive image; a projection lens disposed in front of the holder; and a light source disposed behind the holder. a slider which is movably guided in the longitudinal direction in front of the holder is provided, perpendicular portal to the slider
The guide rails are integrally connected, slidably engaged with the guide rails, and the projection lens is mounted on the lens board substantially parallel to the transparent positive, and the upper edge of the lens board is
Between the top of the guide rail and the lower edge of the lens board
A bellows-like light-shielding body is stretched between the slider and the slider, and a horizontal engaging pin is projected from the side edge of the lens board, and the projected position of the engaging pin is projected by its axis. The lens is set so as to lie in a plane substantially parallel to the transparency and including the center of the exit pupil of the lens, while a horizontal rotation axis in the plane containing the transparency is set near the holder. A control body guided so as to be rotatable around a driving shaft is provided, and a guide slit formed along a longitudinal direction of the control body at a front portion thereof is slidably engaged with the engagement pin. The light source box is carried at the rear end of the control body, while a plane including the axis of the engagement pin and the rotation axis of the control body is a horizontal line segment and a transparent positive image passing substantially through the center of the exit pupil of the projection lens. Set the position of the rotation axis of the control body so that it is almost parallel to the plane containing the horizontal line passing through the center of Also characterized in that the optical axis of the light source box is to be substantially aligned with the line connecting the approximate center of the exit pupil and the center of the projection lens transparency.

[0011]

The projector according to the first aspect of the present invention having the above-described structure is used when the magnification of the transparent image is constant.

As is well known, when the focal length of the projection lens is constant and the distance between the transparent lens and the projection lens is constant, the relative position of the projector with respect to the screen is changed to enlarge the projected image of the transparent lens on the screen. Can be focused, and the distance between the screen and the projector at the time of focusing is uniquely determined by the distance between the transparencies and the projection lens, and therefore the magnification is also uniquely determined.

After focusing on the enlarged projection image of the transparent positive image as described above, for example, when the front end of the control body is lifted forward by hand, the lens engaged with the control body via the engagement pin The board and the integral projection lens rise along the guide rail.

As described above, when the projector according to the present invention is viewed from the side, a line connecting the axis of the engagement pin, the rotation axis of the control body, the center of the transparent positive image, and the approximate center of the exit pupil of the projection lens. Since the projection lens rises reciprocally with respect to the transparent image with the optical axis of the light source box always passing almost the center of the exit pupil of the projection lens, the rotation angle of the control body The amount of shift and tilt that occurs depends on the size of the enlarged transparent image on the screen, without distorting.
It rises relatively to the fixed projector.

When the translucent image is within the image circle of the projection lens, the enlarged image is in focus and sharp over the entire surface.

If a helicoid is attached to the projection lens, fine adjustment of focus becomes easy.

If the projection lens is a zoom lens, it is easy to change the magnification of the transparent image. Needless to say, if a helicoid is attached to the zoom lens, fine adjustment of the focus becomes easy.

In the projector according to the second aspect of the present invention, since the guide rail connected to the slider can move in the front-rear direction together with the slider, the distance between the transparent image and the projection lens changes with the movement. Therefore, the magnification can be easily changed even if the projection lens is a so-called single focus lens having a constant focal length. Also, fine adjustment of the focus is easy even if a helicoid is not attached to the projection lens.

The other operations are the same as those of the first aspect, and the description is omitted.

[0020]

Next, an embodiment of the present invention will be described with reference to the drawings. For convenience of explanation, the description of the invention described in claim 2 will be started.

In FIGS. 1 and 2, reference numeral 1 denotes an entire projector according to an embodiment of the present invention. The projector 1 includes a slide feeding unit 2 and a projection unit 3. Shall be.

Here, the slide means a transparent positive image loaded on a so-called mount, and the slide feeding section 2 in the illustrated embodiment includes a large number of slides 4 and 4.
A so-called straight magazine 5 in which the magazines (FIG. 1) are stacked and loaded in the thickness direction is provided. Each time a control signal is generated, the magazine 5 is moved in the front-rear direction (in FIG.
It has a so-called automatic change function in which the slide 4 that has been carried on the holder 6 (FIG. 2) is pulled out and accommodated in the magazine 5 and the next new slide is loaded into the holder 6 by moving it step by step.

Since the above-mentioned slide autochanger and holder 6 have been used for a long time and are well known, further detailed description is omitted. In addition, the present invention is not limited to the projector having the above-described straight magazine auto-changer, but also includes a so-called rotary magazine-equipped auto-changer, a projector that is used in a roll film state without mounting a transparent positive image, or a manual slide. The present invention can be applied to all types of projectors such as a projector which is exchanged by the user.

A support 8 extends in the front-rear direction on the bottom surface of the outer case 7 in front of the holder 6 (to the left in FIG. 2). , A plate-like slider 9 (FIG. 1) that is long in the front-back direction is supported and guided movably in the front-back direction.

At the front end of the slider 9, a guide rail 10 having a substantially gate-like overall shape is integrally connected, and a pair of mutually parallel rail rods is vertically connected to the slider 9.

The lens board 11 is vertically slidably guided between the pair of rails of the guide rail 10 while maintaining a relational position parallel to the transparent positive image carried by the holder 6. I have.

At the center of the lens board 11, a projection lens 12 is mounted so as to penetrate it in the thickness direction.

Light from a light source described later leaks forward between the upper edge of the lens board 11 and the top of the guide rail 10 and between the lower edge of the lens board and the slider 9 (FIG. 1). In order to prevent the
13 is stretched. In addition, although illustration is omitted for clarity of the drawing, a light-shielding body is appropriately provided at a necessary portion.

Although this is not an essential component of the present invention, as shown in FIG. 2, the lens board 11 and the projection lens 12 are suspended by a tape-shaped leaf spring called a natural contact type spiral spring. It is desirable. The natural contact type spiral spring 14 is a spring formed by bending a tape-shaped spring plate so that each portion in the longitudinal direction has a constant curvature. In a natural state, as shown in the upper part of FIG. In addition, the spring plates are wound and contracted so as to contact each other.
Then, as shown in FIG. 3, when a force P is applied to one end of the spring and the spring is pulled downward, the spring unwinds substantially linearly. At this time, a tensile force P is presented to the outside as a reaction force, and the tensile force P is substantially constant irrespective of the length of the part that is unwound and straightened. That is,
Since the spring constant of this spring is almost 0, if the tensile force P is set to a value obtained by subtracting the frictional resistance from the sum of the weight of the lens board 11 and the weight of the projection lens, the height of the lens board 11 at any height. Even balance.

An engaging pin 15 is provided at the side edge of the lens board 11 supported and guided as described above. In general, the projecting position of the engagement pin is set so that its axis is in a plane substantially including the center of the exit pupil of the projection lens 12 and substantially parallel to the transparency, but in the illustrated embodiment. The engagement pin 15 is protruded from the side edge of the lens board 11 so that its axis passes substantially at the center of the exit pupil of the projection lens 12. Then, as shown in FIG. 2, a slit (not numbered) formed in one rail rod of the guide rail 10 is inserted and protrudes to the side of the guide rail 10.

On the other hand, as shown in FIG. 1 and FIG.
A long and slender control body 17 is disposed rotatably about a horizontal rotation axis.

The position of the rotation axis of the control body 17 is generally in a plane containing the transparent image, and when the projector according to the present invention is viewed from the side, the axis of the engagement pin 15 The rotation axis of the body 17, the center of the transparency, and the center of the exit pupil of the projection lens 12 are set so as to form a parallelogram. As described above, the projecting position of the engaging pin 15 is projected by the axis. Since the lens is set so as to pass substantially through the center of the exit pupil of the lens 12, in the embodiment shown in FIG.
Is set to pass through the center of the transparency.

As shown in FIG. 2, a guide slit 17a is formed at the front end of the control body 17 along the length thereof, and the guide slit 17a is formed in the guide slit 17a.
5 are slidably engaged.

On the other hand, a light source box 18 is mounted at the rear end of the control body 17. The light source box 18 is provided with a light source such as a halogen bulb, a reflecting mirror, a condenser lens, a heat-insulating filter, and the like as in a normal projector. It is supposed to. It is desirable that this light source box 18 is also suspended by the above-mentioned natural contact type spiral spring 14.

The optical axis of the light source box 18 is set so as to substantially match the line connecting the center of the transparent image and the center of the exit pupil of the projection lens.

Although this is not an essential component of the present invention, the bearing portion of the control body 17 in the illustrated embodiment has a large frictional moment intentionally set, and the set angle of the control body 17 is set. The position is kept stable. Alternatively, besides making the bearing portion of the control body 17 so-called bitter as described above, a set screw (not shown) for fixing and releasing the slider 11 on the guide rail 10 is provided, for example, in the manner of a set screw. Is also good.

A rack 21 extending in the front-rear direction is integrally connected to the side surface of the guide rail 10, and
The slider 9 and the guide rail 10 can be moved back and forth by engaging the pinion 22 which is rotatably supported on the outer case and turning the adjustment knob 23 (FIG. 1) from outside the outer case.

In the projector according to the embodiment of the present invention as described above, the distance between the transparent image and the screen and the distance between the transparent image and the projection lens are appropriately adjusted. Set the magnification of the transparencies and focus.

Thereafter, for example, by inserting a hand through the front opening of the projector and moving the front end of the control body 17 up and down,
With the vibration of the control body 17, the lens board 11 and the projection lens 12 integrated therewith move up and down along the guide rail 10.

That is, as shown in FIG.
On the other hand, the transparent positive image t moves up and down relatively in a plane perpendicular to the optical axis X of the projection lens, so that the enlarged image T also moves up and down largely on the screen S without distortion.

If the transparent positive image t is within the image circle AB of the projection lens 12, the enlarged image T is in focus and sharp over the entire surface.

It should be noted that the invention described in claim 1 is applied to claim 2
Since the slider 9 according to the invention described in (1) is equivalent to the one in which the slider 9 is fixed at one place, detailed description thereof is omitted.

The projector in the illustrated embodiment shifts the projection lens relatively upward with respect to the holder 6, but this shifts the projection lens downward according to the situation of the screen installation location. May be
Or set the projector at 90 ° around the optical axis of the projection lens.
Of course, it may be rotated and shifted in the horizontal direction.

[0044]

As is apparent from the above description, the first aspect of the present invention provides a lens board in which a vertical guide rail is provided in front of a holder for holding a transparent positive image, and a projection lens is mounted on the guide rail. Slidably engage, while
In the vicinity of the holder, a control body having a horizontal rotation axis in a plane containing the transparent image is provided, a light source box is attached to the rear of the control body, and the front end is engaged with the lens board, and The control body can be swung while the optical axis always passes through the center of the translucent image and almost the center of the exit pupil of the projection lens, so that the projector can be provided with a shift and tilt function, thus making the projector stand out. In this way, a clear image without distortion can be magnified and projected on the screen.

Further, since the optical axis of the light source box always passes through the center of the transparent image and substantially the center of the exit pupil of the projection lens, the brightest projected image can be always obtained regardless of the degree of tilt.

According to the second aspect of the present invention, since the guide rail is connected to the slider which can move in the front-rear direction, in addition to the above-described effects, it is easy to change the magnification of the projected image and adjust the focus. To play.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of a projector according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional side view of a projector according to an embodiment of the present invention.

FIG. 3 is a side view of a natural contact type spiral spring.

FIG. 4 is a diagram for explaining shift and tilt.

[Explanation of symbols]

 Reference Signs List 6 Holder 8 Support stand 9 Slider 10 Guide rail 11 Lens board 12 Projection lens 15 Engagement pin 17 Controller 17a Guide slit 18 Light source box

Claims (2)

(57) [Claims] 1. A holder having a transparent positive image, a projection lens disposed in front of the holder, and a light source disposed in the rear of the holder . A guide rail is fixedly mounted, slidably engaged with the guide rail, and a projection lens is mounted on a lens board substantially parallel to the transparent image, and the upper edge of the lens board and
Between the top of the guide rail and the lower edge of the lens board
And a bellows-like light shield between the guide rail and the lower frame,
A horizontal engaging pin is protruded from the side edge of the lens board. Is set in the vicinity of the holder, on the other hand, in the vicinity of the holder, a horizontal rotation axis is set in a plane containing the transparent positive image, and a control body guided to be rotatable around this rotation axis is provided. A guide slip formed in the front of the control body along its length.
The control lens is slidably engaged with the engagement pin, and a light source box is supported on the rear end of the control body. On the other hand, a plane including the axis of the engagement pin and the rotation axis of the control body is a projection lens. The position of the rotation axis of the control body is set so as to be substantially parallel to a plane including a horizontal line passing through the center of the exit pupil and a horizontal line passing through the center of the transparent image. A projector characterized in that the optical axis substantially matches a line segment connecting the center of the translucent image and the center of the exit pupil of the projection lens. 2. A device having a holder for carrying a transparent positive image, a projection lens disposed in front of the holder, and a light source disposed in rear of the holder. Is provided, and a vertical gate-shaped guide rail is integrally connected to the slider, slidably engaged with the guide rail, and the projection lens is mounted on a lens board substantially parallel to the transparent positive. Attach,
Between the top edge of the lens board and the top of the guide rail, and
Between the bottom edge of the lens board and the slider
A light body is stretched, and a horizontal engaging pin is protruded from a side edge of the lens board. The protruding position of the engaging pin includes an axis including substantially the center of the exit pupil of the projection lens. It is set so that it is in a plane that is almost parallel to the transparency, while a horizontal rotation axis that is in the plane that contains the transparency is set near the holder so that it can rotate around this rotation axis. the guided control body provided, front portion of forming I along its length direction of the control member
The guide slit is slidably engaged with the engagement pin , and the light source box is supported at the rear end of the control body.
A plane including the axis of the engagement pin and the rotation axis of the control body is substantially parallel to a plane including a horizontal line passing substantially through the center of the exit pupil of the projection lens and a horizontal line passing through the center of the transparent image. The position of the rotation axis of the control body is set as described above, and the optical axis of the light source box is substantially aligned with a line connecting the center of the translucent image and substantially the center of the exit pupil of the projection lens. Projector.