JP2002318407A - Diopter adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diopter adjusting device capable of changing the range of the moving distance of a lens holder even in the case of one lens holder. SOLUTION: In this diopter adjusting device for adjusting a distance between a liquid crystal display panel and an enlarging lens in video equipment constituted of the lens holder 10 in which the enlarging lens is housed and also on whose surface a cam groove is formed, an adjusting lever 11, and a holding case 12 in which the holder 10 is housed and where a guide hole 13 for regulating the movement of the lever 11 is formed; the holder 10 is formed to be replaced in the case 12, and also a plurality of cam grooves 16 and 17 respectively abutting on the lever 11 before and after such replacement and having the different range of the distance where the holder 10 is moved are formed on the surface of the holder 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diopter adjusting device suitably used for a viewfinder in a video device such as a digital camera.

[0002]

2. Description of the Related Art Conventional general viewfinders are:
For example, as shown in FIG. 4, the liquid crystal display panel 101 is stored in a body 100, and a holding case (also used as an eyepiece cover in FIG. 4) 102 is attached to the body 100. The lens holder 103 containing the magnifying lens 104 is stored therein. A general diopter adjusting device used for the viewfinder is configured such that an observer H uses the lens holder 103.
By adjusting the degree of insertion, that is, the distance between the liquid crystal display panel and the magnifying lens, the focus is adjusted in accordance with the visual acuity.

The general diopter adjusting device will be described in detail with reference to FIG. In FIG. 5, the diopter adjusting device includes a holding case 102 and a lens holder 10 shown in FIG.
3 and an adjusting lever 106, and the adjusting lever 106 is incorporated in a guide hole 107 formed in the holding case 102. The adjusting lever 106 comes into contact with a cam groove 108 formed on one surface of the lens holder 103. The cam groove 108 is arranged at a predetermined angle with respect to the guide hole 107. An observer with normal vision operates the adjustment lever 106 at the center of the guide hole 107, and a myopic or hyperopic observer operates the adjustment lever 106 by operating the adjustment lever 106 at one of both ends. Move the lens holder 10
3 is adjusted so that the degree of insertion is adjusted to perform focusing. In such a diopter adjustment device, the adjustment range of the degree of insertion of the lens holder 103 is:
Cam groove 108 formed on one side of lens holder 103
Is determined only in a certain range determined by the above.

[0004]

By the way, video equipment such as a video camera using a view finder includes:
In recent years, miniaturization and price reduction have been demanded, and operability that is easy for observers to use has been demanded. Along with this, there is a demand for smaller and less expensive viewfinders, and to meet this demand, it is necessary to reduce the size of the diopter adjustment device, which is a component of the viewfinder, and reduce the cost of the liquid crystal display panel. .

In order to reduce the size of the diopter adjusting device,
It is necessary to shorten the moving range of the adjustment lever and the moving range of the lens holder. However, in the diopter adjusting device as described above, since the adjusting lever 106 is operated within one cam groove 108 formed in the lens holder 103, the moving range of the adjusting lever 106, the lens holder When the moving range of the 103 is shortened, it becomes difficult to perform the focusing operation, and this tendency is particularly remarkable for an observer of visual acuity who operates the adjustment lever 106 on one of both ends of the cam groove 108. Then, in order for the observer to operate the adjustment lever with good operability, a plurality of lens holders having a moving range corresponding to the observer's eyesight must be prepared.

In order to reduce the cost of a liquid crystal display panel, liquid crystal display panels of different sizes must be
It is necessary to share the components such as the frame.

However, if the size of the liquid crystal display panel is different, the positional relationship of the magnifying lens with respect to the liquid crystal display panel is also different, so that the lens holders are set at different positions. A single lens holder that moves and focuses only by itself cannot be used for a plurality of liquid crystal display panels of different sizes. Then, a plurality of lens holders corresponding to the size of the liquid crystal display panel must be prepared.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a diopter adjustment device that can change the range of the movement distance of a single lens holder. I do.

[0009]

In order to solve the above-mentioned problems, a diopter adjusting device according to the present invention is arranged such that an adjusting lever is brought into contact with a cam groove formed on a surface of a lens holder accommodating an enlarged lens, and The holding case for storing the lens holder is formed at a predetermined angle with respect to the cam groove to form a guide hole for restricting the movement of the adjustment lever, and moves along the guide hole in the holding case. A diopter adjustment device for adjusting a distance between an image display means and the magnifying lens in an image device configured to move the lens holder in conjunction with the adjustment lever, wherein This lens is formed so as to be replaceable in the case, and contacts with the adjustment lever before and after replacement on the surface of the lens holder. Wherein the range of the distance of moving the Ruda formed the different cam grooves.

According to the above configuration, the lens holder is formed so as to be replaceable in the holding case,
Since a plurality of cam grooves, each of which comes into contact with the adjustment lever before and after the replacement on the surface of the lens holder and which has a different range of distance for moving the lens holder, are formed, the replacement of one lens holder only requires the replacement of one lens holder. The moving range can be changed, and a cam groove having a desired moving range formed in the lens holder can be selected to adjust the distance between the lens holder and the image display means. Further, since a cam groove in a desired moving range can be selected, a cam groove corresponding to the size is formed for the image display means having different sizes, so that the lens holder and the image display means can be connected to each other. The distance can be adjusted, and the cam grooves suitable for the visual acuity of the observer can be formed, so that the position of the adjustment lever interlocking with it can be made easy to use, and the conventional diopter adjustment device can be used. The operability is better in comparison.

The invention according to claim 2 is characterized in that, in the above configuration, the lens holder is formed in a polygonal body, and the cam grooves are formed on at least two different surfaces.

According to the above configuration, each cam groove can be formed without being restricted by other cam grooves. Further, the invention according to claim 3 is characterized in that, in the above configuration, a notch introduction portion for guiding the adjustment lever into the cam groove is formed at one end of the cam groove, and the other end is closed. I do.

According to the above construction, the adjustment lever can be inserted from the notch introduction portion, so that the lens holder can be easily replaced, and the direction in which the lens holder is replaced can be regulated. Can be prevented from being erroneously inserted.

According to a fourth aspect of the present invention, in the above configuration, a guide rib is provided on a surface of the lens holder where the cam groove is not formed, and the guide groove guides the guide rib into the holding case. Is formed.

According to the above configuration, the lens holder is positioned by the guide groove and can be moved while maintaining a predetermined angle with respect to the image display means. As a result, the displacement of the optical axis between the magnifying lens and the image display means can be reduced. Can be prevented.

Further, the invention according to claim 5 is characterized in that, in the above-described configuration, display portions for distinguishing the plurality of cam grooves are provided near the plurality of cam grooves formed in the lens holder. I do.

According to the above configuration, the replacement of the lens holder can be performed according to the display. The diopter adjustment device of the present invention is suitably used as a viewfinder in various video devices such as a digital camera, a video camera, an electronic still camera, and a pocket television.

In the diopter adjusting apparatus according to the present invention, in order to form a plurality of cam grooves having different distance ranges for moving the lens holder, for example, a method of forming the cam grooves at different angles with respect to the guide holes, and forming the cam grooves. A method of making the position, that is, the position at which the notch introduction portion is formed in the plane in which the cam groove is formed different, may be mentioned.

[0019]

Embodiments of the present invention will be described below. (Embodiment 1) FIG. 1 is an exploded perspective view showing a diopter adjusting apparatus according to an embodiment of the present invention, in which a lens holder is replaced in accordance with the eyesight of an observer. Is used by being attached to a viewfinder provided with a liquid crystal display panel (image display means) as shown in FIG. 4, for example.

In FIG. 1, the diopter adjustment device is formed by a lens holder 10 containing an enlarged lens, an adjustment lever 11 for moving the lens holder 10, and a holding case 12 for storing the lens holder 10. Have been.

The adjusting lever 11 includes a pin 11a protruding upward, a flat plate portion 11b, and a grip portion 11c protruding downward. The holding case 12 also serves as an eyepiece cover, and its bottom plate has a rectangular guide hole 13 for restricting the movement of the adjustment lever 11.
Are formed in parallel with the liquid crystal display panel to be observed, the flat plate portion 11b of the adjustment lever 11 is supported by the bottom plate portion, and the grip portion 11c is formed in the guide hole 1.
3, the adjusting lever 11 is configured to slide along the guide hole 13 and move within the range. Further, guide grooves 15 for inserting guide ribs 14 formed on both side surfaces of the lens holder 10 are formed inside the both side plate portions of the holding case 12, respectively. By inserting the lens holder 10 into the groove 15, the lens holder 10 is moved while maintaining a predetermined angle with respect to the liquid crystal display panel to be observed.

Further, the lens holder 10 is formed in a rectangular parallelepiped, and is formed so that it can be replaced with the holding case 12 when it is turned upside down. Thus, different cam grooves 16 and 17 each inclined at a predetermined angle are formed. A pin 1 of the adjustment lever 11 is provided on one end side of the surface on which the respective cam grooves 16 and 17 are formed.
Notch introduction portions 18 and 19 for guiding the first notch 1a are formed, and the other end side is closed.
Reference numerals 8 and 19 are formed at mutually different positions in the plane where the cam grooves 16 and 17 are formed. The above cam groove 1
6 and 17 have different inclination angles and the notch introduction portions 18
By forming the lens holders 19 and 19 at different positions, the range of the moving distance of the lens holder 10 is different from each other.

The adjustment lever 11 and the lens holder 10 are connected by inserting the pins 11a into notch introduction portions 16 and 17 formed at one end of the cam grooves 16 and 17, respectively.

Further, the lens holder 10 is provided with display portions 20 and 21 for indicating the degree of visual acuity on the surfaces on which the different cam grooves 16 and 17 are formed. For example, if the cam groove 16 is a cam groove suitable for a hyperopic observer, the display section 20 in the vicinity of the cam groove 16 displays "farsight side". On the other hand, if the cam groove 17 is a cam groove suitable for a myopic observer, the display section 21 near the cam groove 17 displays "myopia side".

In the above configuration, for example, when a myopic observer intends to operate the diopter adjusting device, the cam grooves 17 of the lens holder 10 having a "myopia side" indication by looking at the display sections 20 and 21 are shown. The guide rib 14 is inserted into the guide groove 15 with the side on which the cam groove 17 is formed facing downward, and the pin 11 a is introduced into the cam groove 17 through the notch introduction portion 19. Thereby, the lens holder 10 and the adjustment lever 11 are connected.

Next, when the pin 11a is moved along the guide hole 13 by operating the grip portion 11c,
The pin 11a contacts the cam groove 17, and the degree of insertion of the lens holder 10 in conjunction with the movement of the pin 11a, that is, the distance between the lens holder 10 and the liquid crystal display panel is adjusted.

According to the above configuration, the cam grooves 16 and 1 suitable for the hyperopia and myopia observers are provided in the lens holder 10.
Since the grooves 7 are formed, it is possible to select a cam groove suitable for each according to the eyesight of the observer, and it is possible to adjust the degree of insertion of the lens holder 10 with good operability. In addition, since the guide ribs 14 are formed on the lens holder 10 and the guide grooves 15 are formed on the holding case 12, the lens holder 10 can be moved while holding a predetermined angle with respect to the liquid crystal display panel. Of the optical axis between the liquid crystal panel and the liquid crystal display panel can be prevented. Further, a pin 11a is provided at one end of the cam groove 16 (17).
Notch introduction part 18 (19) for guiding
The lens holder 10 can be easily replaced, and the direction at the time of replacing the lens holder 10 can be regulated, so that erroneous insertion at the time of replacement can be prevented. In addition, since the display portions 20 and 21 for distinguishing the cam grooves 16 and 17 are formed, the lens holder 1 is formed.
The replacement of 0 can be performed according to the display. (Embodiment 2) FIG. 2 is an exploded perspective view showing a diopter adjusting apparatus according to another embodiment of the present invention, in which liquid crystal display panels of different sizes are applied to a viewfinder constituted by a common frame. It is.

In FIG. 2, the diopter adjusting device comprises a lens holder 30 containing an enlarged lens, an adjusting lever 31 for moving the lens holder 30, and a holding case 32 for storing the lens holder 30. Is done.

The adjusting lever 31 includes a pin 31a projecting upward, a flat plate portion 31b, and a grip portion 31c projecting downward. A rectangular guide hole 34 for regulating the movement of the adjustment lever 31 is formed in the bottom plate of the holding case 32 in parallel with the liquid crystal display panel 33 to be observed. The flat plate portion 31b is supported by the bottom plate portion and the grip portion 31
c is inserted into the guide hole 34, and the adjustment lever 31 is configured to slide along the guide hole 34 and move within the range. Also, this holding case 3
Guide grooves 36 for inserting guide ribs 35 formed on both side surfaces of the lens holder 30 are formed on both side plate portions of the lens holder 2, respectively. By inserting the guide ribs 35 into the guide grooves 36, , Lens holder 30
Is moved while maintaining a predetermined angle with respect to the liquid crystal display panel 33 to be observed. Further, on the rear side of the holding case 32, a concave plate 37 formed by cutting a central portion into a concave shape is formed.
A panel holding portion 44 for storing the liquid crystal display panel 33 is formed at the rear thereof, and the concave portion of the concave plate 37 constitutes a frame for regulating the outer edge of the liquid crystal display panel 33, Regardless of the size of the liquid crystal display panel, both large and small liquid crystal display panels are configured to be observed through the concave portion.

Further, the lens holder 30 is formed in a rectangular parallelepiped, and is formed so that it can be replaced with the holding case 32 when it is turned upside down. Thus, different cam grooves 38 and 39 inclined at a predetermined angle are formed. One end of the cam groove 38, 39 is formed on one end of the cam groove 38, 39.
Notch introduction portions 40 and 41 for guiding 1 a are formed, respectively, and the other end is closed. The length of notch introduction portion 41 is formed longer than the length of notch introduction portion 40. The cam grooves 38 and 39 have different inclination angles and different lengths of the notch introduction portions 40 and 41, so that the range of the moving distance of the lens holder 30 is different from each other.

The adjustment lever 31 and the lens holder 30 are connected by inserting the pins 31a into notch introduction portions 40, 41 formed at one end of the cam grooves 38, 39.

Further, the lens holder 30 is provided with display portions 42 and 43 indicating the size of the liquid crystal display panel on the surface where the different cam grooves 38 and 39 are formed. For example, if the cam groove 38 is a cam groove necessary for a liquid crystal display panel having a size of 0.5 inch, "0.5" is displayed on the display section 42 near the cam groove. On the other hand, if the cam groove 39 is a cam groove required for a liquid crystal display panel having a size of 0.3 inch, "0.3" is displayed on the display section 43 in the vicinity thereof.

According to the above configuration, even when two types of liquid crystal display panels having different sizes are provided in a common frame,
By selecting a cam groove corresponding to the size, the distance between the lens holder 10 and the liquid crystal display panel can be adjusted. In addition, since the guide rib 35 is formed on the lens holder 30 and the guide groove 36 is formed on the holding case 32, the lens holder 30 can be moved while maintaining a predetermined angle with respect to the liquid crystal display panel. Can prevent erroneous insertion when replacing
The same effects as in the first embodiment can be obtained, for example, the replacement of the lens holder 30 can be performed according to the display.
(Embodiment 3) FIG. 3 is a perspective view of a main part of a diopter adjusting apparatus according to another embodiment of the present invention, in which a plurality of cam grooves are formed on the same surface of a lens holder.

In FIG. 3, an enlarged lens 51 is stored in a lens holder 50, and two cam grooves 5 having different inclination directions and inclination angles are provided on the same surface of the lens holder 50.
2 and 53 are formed to intersect with each other,
Notch introduction parts 54 and 55 are formed in 2 and 53.

The diopter adjusting device provided with the lens holder 50 having the above-described configuration can be used as a cam groove suitable for a hyperopic or myopic observer as described in the first embodiment, for example.

In FIG. 3, two cam grooves 52,
One of 53 may be deleted to form a cam groove 56 on the other surface, and a notch introduction portion 57 may be provided in this. As described above, one or more cam grooves may be formed on the same surface of the lens holder. Also, a cam groove may be formed on another surface at the same time.

In the first to third embodiments, the shape of the lens holder is a rectangular parallelepiped, but may be another polygon. Further, the shape of the lens holder may be cylindrical, and in this case, the same effect as that of the polygon can be obtained.

One or more guide ribs may be formed on the lens holder. Further, only one display may be formed near the cam groove.

[0039]

As described above, according to the diopter adjusting apparatus of the present invention, since a plurality of cam grooves having different ranges of moving distance are formed in the lens holder, only one lens holder needs to be replaced. Thus, the moving range of the lens holder can be changed, and a cam groove having a desired moving range formed on the lens holder can be selected to adjust the distance between the lens holder and the image display means. Then, since a cam groove in a desired moving range can be selected, the lens holder and the image display means are formed by forming the cam grooves corresponding to the sizes even for a plurality of image display means having different sizes. The conventional diopter adjusting device can adjust the distance of the diopter, and can easily adjust the position of the adjusting lever interlocking with the cam groove by forming the cam grooves suitable for the observer's visual acuity. Operability is better than.

According to the second aspect of the present invention, each cam groove can be formed without being restricted by other cam grooves. According to the third aspect of the present invention, since the adjustment lever can be inserted from the notch introduction portion, the lens holder can be easily replaced,
In addition, the direction in which the lens holder is replaced can be restricted, and erroneous insertion at the time of replacement can be prevented.

According to the fourth aspect of the present invention, the lens holder is positioned by the guide groove and can move the lens holder while maintaining a predetermined angle with respect to the image display means. Of the optical axis can be prevented.

Further, according to the invention described in claim 5,
The replacement of the lens holder can be performed according to the display.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a diopter adjusting device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a diopter adjusting device according to another embodiment of the present invention.

FIG. 3 is a perspective view of a main part of a diopter adjusting device according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a basic configuration of a conventional general view finder.

FIG. 5 is an exploded perspective view showing a conventional diopter adjustment device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lens holder 11 Adjustment lever 11a Pin 11b Flat part 11c Grip part 12 Holding case 13 Guide hole 14 Guide rib 15 Guide groove 16, 17 Cam groove 18, 19 Notch introduction part 20, 21 Display part 30 Lens holder 31 Adjustment lever 32a Pin 32b flat plate part 32c grip part 32 holding case 33 liquid crystal display panel 34 guide hole 35 guide rib 36 guide groove 37 concave plate 38, 39 cam groove 40, 41 notch introduction part 42, 43 display part 44 panel holding part 50 lens holder 51 Enlarge Lenses 52, 53, 56 Cam grooves 54, 55, 57 Notch introduction part 100 Body 101 Liquid crystal display panel 102 Holding case 103 Lens holder 104 Magnifying lens 106 Adjusting lever 107 Guide hole 108 Cam groove

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // H04N 101: 00 H04N 101: 00

Claims (5)

[Claims] An adjustment lever is brought into contact with a cam groove formed on a surface of a lens holder accommodating an enlarged lens, and is disposed at a predetermined angle with respect to the cam groove in a holding case for storing the lens holder. A guide hole for restricting the movement of the adjusting lever, and moving the lens holder in conjunction with the adjusting lever moving along the guide hole in the holding case. A diopter adjustment device for adjusting a distance between an image display means and the magnifying lens, wherein the lens holder is formed so as to be replaceable in the holding case, and before and after replacement on the surface of the lens holder. A plurality of cam grooves having different ranges of distance for contacting the adjustment lever and moving the lens holder are formed. Diopter adjustment device according to claim. 2. The lens holder is formed in a polygonal body,
The diopter adjusting device according to claim 1, wherein the cam grooves are formed on at least two different surfaces. 3. A view according to claim 1, wherein a notch introduction portion for guiding the adjusting lever into the cam groove is formed at one end of the cam groove, and the other end is closed. Degree adjustment device. 4. The lens holder according to claim 1, wherein a guide rib is provided on a surface of the lens holder where the cam groove is not formed, and a guide groove for guiding the guide rib is formed in the holding case. 3. The diopter adjustment device according to 3. 5. The display device according to claim 1, wherein a display portion for distinguishing the plurality of cam grooves is provided near the plurality of cam grooves formed in the lens holder. Diopter adjustment device.