JP2000089299A - Finder equipped with diopter adjusting mechanism and photographing device using the finder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a finder equipped with a diopter adjusting mechanism and a photographing device using the same capable of respectively adjusting diopter obtained when an observer views a subject from the finder and diopter obtained when he(she) views a field frame within a finder or a display part such as a display inside or outside field. SOLUTION: This finder is provided with objective optical systems 1 and 2, an ocular optical system 7 observing an object image formed by the optical systems 1 and 2, and the display part 9 performing display for the observer through at least the optical system being a part of the optical systems 1 and 2, and 7; and is equipped with the 1st diopter adjusting mechanism for adjusting the diopter in the case of observing the subject through the optical systems 1 and 2, and 7 and the 2nd diopter adjusting mechanism for adjusting the diopter in the case of observing the display part through a part of the optical systems.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finder having a diopter adjusting mechanism and a photographing apparatus using the same, and is suitable for a camera, a still camera, a video camera, and the like.

[0002]

2. Description of the Related Art Conventionally, for example, a viewfinder of a compact camera generally uses a real image type viewfinder capable of clearly recognizing an area corresponding to a photographing range and a position corresponding to a distance measuring point position.

On the other hand, with the zooming of the photographing lens, the magnification of the finder increases as the photographing magnification increases, and the diopter shift of the finder increases depending on the distance to the subject. There is a situation where even a human being can not see normally because it exceeds the limit.

[0004] In view of the above, for example, Japanese Patent Laid-Open No. 2-23
In the technology related to finder driving disclosed in Japanese Patent Application Laid-Open No. 0226 and Japanese Patent Application Laid-Open No. 3-81748, a finder is driven to a predetermined position based on distance information of a camera. That is, Japanese Unexamined Patent Application Publication No. Hei.
In the technology disclosed in Japanese Patent Application Laid-Open Publication No. H10-157, when the object distance requires correction of the finder diopter, the focus unit of the external finder system is automatically controlled to perform focus control over the entire object distance. The degree is automatically corrected to always provide good viewfinder observation. Japanese Patent Application Laid-Open No. 63-206731 discloses a technique for detecting diopter and automatically correcting diopter position. In this technique, a value related to the refractive power of the eye of a person looking through a finder is detected, the position of a lens of the finder optical system is adjusted according to the detected value, and diopter correction of the finder optical system is performed.

Further, in Japanese Patent Application Laid-Open No. Hei 8-190129, the diopter shift is automatically adjusted by moving a part of the optical system in consideration of both the diopter shift due to the subject distance and the photographer's diopter shift. A technique for correcting the error is disclosed.

[0006]

However, the techniques disclosed in Japanese Patent Application Laid-Open Nos. Hei 2-230226 and Hei 3-81748 cannot adjust the viewfinder with respect to the diopter of an individual. Further, the technique disclosed in Japanese Patent Application Laid-Open No. 63-206731 can cope with a change on the photographer side, but cannot cope with a change on the subject side. Further, in Japanese Patent Laid-Open No. Hei 8-190129, diopter changes due to changes in both the subject and the photographer are dealt with, but diopters of a display unit inside and outside the visual field, such as a real image type finder, are also handled. In this case, there is a problem that a diopter shift occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object the diopter when an observer looks at a subject from a finder, a field frame in the finder, and a display inside and outside the field of view. To provide a finder having a diopter adjustment mechanism capable of correcting the diopter when viewing the display unit, and a photographing apparatus using the same.

[0008]

SUMMARY OF THE INVENTION A finder having a diopter adjusting mechanism and a photographing apparatus using the same according to the present invention have the following features.

[1]: Observation via an objective optical system, an eyepiece optical system for observing an object image formed by the objective optical system, and at least a part of the objective optical system and the eyepiece optical system A first diopter adjustment mechanism for adjusting diopter when observing the subject through the objective optical system and the eyepiece optical system, and a part of the optical system; A finder having a diopter adjustment mechanism, comprising a second diopter adjustment mechanism for adjusting diopter when observing a display unit via a system.

[2] A finder having a diopter adjustment mechanism according to [1], wherein the display section is a field frame or a display inside or outside the field of view.

[3] A finder having a diopter adjustment mechanism according to [1] or [2], wherein the finder is a real image finder.

[4]: When the diopter is adjusted by the first diopter adjustment mechanism, the diopter when observing the display section is constant [1], [2] or [ 3] A finder having the diopter adjustment mechanism described in the above.

[5]: The first diopter adjustment mechanism adjusts the diopter by moving the eyepiece optical system and the display unit while maintaining the positional relationship between the eyepiece optical system and the display unit. 4] A finder having the diopter adjustment mechanism described in the above.

[6]: The second diopter adjustment mechanism adjusts diopter by moving at least a part of the eyepiece optical system in the optical axis direction to change the positional relationship with respect to the display unit. A finder comprising the diopter adjustment mechanism according to any one of [1] to [5].

[7] The method according to any one of [1] to [6], wherein the first diopter adjusting mechanism and the second diopter adjusting mechanism can be set by a photographer himself. Viewfinder with diopter adjustment mechanism.

[8]: any one of [1] to [7], wherein the display unit is not provided on the primary imaging surface of the objective optical system.
A finder having the diopter adjustment mechanism according to the above section.

[0017]

[9]: The viewfinder having the diopter adjustment mechanism according to any one of [1] to [8], wherein the objective optical system is a variable power optical system.

[10]:

[9] The finder having a diopter adjustment mechanism, wherein the maximum finder satisfies 1.0 <γ _max <3.5 when the maximum magnification of the finder is γ _max .

[11]: Any one of [1] to [10]
In a photographing apparatus comprising: a finder having the diopter adjustment mechanism according to claim 1; and a distance detection means for detecting a subject distance, the first diopter adjustment mechanism operates in accordance with subject distance information from the distance detection means. An imaging device for adjusting diopter.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 is a view showing a first embodiment of the present invention, and shows the configuration of an optical system when viewed from the top of a camera.

In FIG. 1, reference numerals 1 and 2 denote objective lenses which constitute an objective optical system for changing the magnification. As the magnification changes from the wide-angle end to the telephoto end, arrows a and b in FIG. It moves on the optical axis at the intervals shown. Numeral 3 denotes a pentagonal roof prism, which plays a role of folding the optical path compactly in order to make the directions of the images from the objective lenses 1 and 2 appropriate. Reference numeral 4 denotes a field lens which plays a role in adjusting the direction in which the light beam travels. Reference numeral 5 denotes a field frame.
The size of the field frame is determined according to the range to be photographed. Further, a primary image forming surface is formed in the vicinity by the objective optical systems 1 and 2. Reference numeral 6 denotes a dichroic mirror that reflects visible light and transmits near-infrared light. The light beam reflected by this mirror passes through an eyepiece 7 and is converted into substantially parallel light, which is observed by the human eye 8. You.

Reference numeral 9 denotes an LED which emits light at a near-infrared wavelength.
Element (display unit). The light emitted by the LED element 9 passes through the dichroic mirror 6 and is further observed by the human eye 8 through the eyepiece 7. This LE
When viewed from the front as shown in FIG. 2, the D element 9 is divided into three parts as indicated by oblique lines. With such a configuration, the photographer can superimpose the image of the subject on the image of the LED element 9. The reason why the LED element 9 is divided into three parts is that the photographer can recognize the position at which the photographing lens is focused by selecting an LED to be turned on in accordance with, for example, information on the AF distance measurement position. It is.

Here, the magnification of the finder changes with the magnification of the photographing lens, and is set to about twice at the telephoto end. In such a system having a large finder magnification, the diopter of the light beam emitted from the eyepiece 7 greatly changes depending on the distance of the subject from the finder. For this reason, in this embodiment, a first diopter adjustment mechanism for adjusting the diopter by moving the eyepiece 7 is provided. By moving the first diopter adjustment mechanism according to a diopter change caused by a change in the subject distance, the diopter of the subject can be constantly observed irrespective of the subject distance.

Since the diopter when the observer observes the LED element 9 is not related to the subject distance, the eyepiece 7 and the L
By moving the ED element 9 in the direction of the arrow c in conjunction with the ED element 9, the diopter of the subject based on the subject distance is corrected while the diopter of the LED element 9 is kept constant.

Further, human eyes have variations in personal diopters such as myopia and hyperopia. This means that the diopter of the subject and the diopter of the LED element 9 are shifted by the same amount regardless of the subject distance. Therefore, the eyepiece 7 is provided with a second diopter adjustment mechanism that can move alone in the direction of the arrow d. By moving this, it is possible to correct the diopter of the subject and the diopter of the LED element 9 by the same amount. Making it possible.

As described above, according to the present embodiment, the first diopter adjustment mechanism and the second diopter adjustment mechanism are provided independently, so that the observer can view the object based on the subject distance when looking through the finder. The degree shift and the diopter shift when viewing the finder image and the LED element (display unit) when the observer is farsighted or nearsighted can be appropriately set.

In particular, when the first diopter adjustment mechanism is adjusted, the diopter of the display unit does not change during adjustment.
The diopter adjustment according to the subject distance is facilitated. At this time, a mechanism for performing correction by linking the display unit and the eyepiece is achieved, and the adjustment mechanism is achieved with a simple configuration.

Note that the maximum magnification γ of the finder of this embodiment is
The value of max is about twice, but is not limited thereto, and may be set so as to satisfy 1.0 <γ _max <3.5.

If the _maximum magnification γ _max exceeds the lower limit, the diopter shift due to the subject distance is small, and the merit of providing the adjustment mechanism is reduced.

If the maximum magnification γ _max exceeds the upper limit, the stroke for correcting the diopter becomes too long,
It is not preferable because the device becomes large.

It is preferable that the first diopter adjustment mechanism and the second diopter adjustment mechanism are mechanisms that allow the photographer to independently operate and set each adjustment mechanism with a dial, a button or the like while looking through the viewfinder. . This makes it possible to easily adjust the diopter. In particular, once the second diopter adjustment mechanism is set, there is no need to frequently reset it, and the operation and setting are easy.

<Second Embodiment> FIG. 3 shows a second embodiment according to the present invention. In FIG. 3, reference numerals 1 and 2 denote an objective lens, 3 denotes a pentagonal roof prism, and an exit surface 3a.
It has a surface with positive power that has the effect of a field lens. Reference numeral 10 denotes a focus plate on which an index (display unit) indicating a distance measurement position or a center position is displayed.
0, a pattern as shown in FIG. 4 is drawn. Light beams from the objective lenses 1 and 2 are condensed near the focusing plate 10 to form a primary imaging surface.

Reference numeral 5a denotes a visual field frame (display unit) for limiting the visual field, 6 denotes a reflection mirror, 7 denotes an eyepiece, and 8 denotes a human eye. In the present embodiment, the first diopter adjustment mechanism performs diopter correction by interlocking the eyepiece 7 with the focus plate 10 and the field frame 5a. As shown in this figure, the eyepiece 7 is moved in the direction of arrow e, and the focus plate 10 and the field frame 5a are moved in the direction of arrow f. It is a mechanism to move to.

The second diopter adjustment mechanism is a mechanism that moves by the eyepiece 7 alone, as in the first embodiment.

Thus, even if the photographer is in the farsighted or nearsighted state, the photographer can arbitrarily adjust the first diopter adjusting mechanism and the second diopter adjusting mechanism to view from the viewfinder. The diopter of the subject diopter, the field frame, and the index can be appropriately corrected.

<Third Embodiment> FIG. 5 shows a third embodiment according to the present invention. This system is an inverted Galilean mark finder. In this figure, reference numeral 11 denotes an objective lens, 1
Reference numeral 2 denotes a half mirror, 7 denotes an eyepiece, and 8 denotes a human eye. The image from the subject is guided to the human eyes 8 in this order and observed. Reference numeral 5b denotes a field frame and a display unit inside and outside the field of view, and displays the f-number of the photographing lens, the in-focus state, and the like as shown in FIG. The display on the display unit 5b is reflected by the half mirror 12, and is observed by the human eye 8 via the eyepiece 7 so as to overlap the subject image.

In the present embodiment, the first diopter adjusting mechanism is configured such that the half mirror 12, the eyepiece 7, and the display unit 5b move in conjunction with the direction g of the arrow to move the display unit 5b.
The diopter change of the subject due to the change of the subject distance is corrected without changing the diopter of the subject.

The second diopter adjusting mechanism is a mechanism for moving the eyepiece lens 7 independently back and forth in the optical axis direction (the direction of arrow g).

<Example of Photographing Apparatus> FIG. 7 is a schematic view showing an example of the photographing apparatus of the present invention. In the figure, F denotes a finder (showing a side surface) described in the first embodiment, and 20 denotes a finder.
Denotes a photographing lens, 21 denotes a photographing medium such as a CCD or a silver halide film, 22 denotes a driving unit for changing the magnification and focusing of the photographing lens 20, 23 denotes a control unit for controlling the driving unit 22, 24
Is a distance detecting means for detecting a subject distance, and 25 is a zoom operation unit for setting a photographing magnification.

When the photographer operates the zoom operation unit 25,
In response to this, the control means 23 controls the driving means 22 to move the lens groups L1 and L2 of the photographing lens 20 as indicated by arrows h and i, respectively, to perform magnification. At this time, the driving means 22 is connected to the finder F via an interlock mechanism (not shown).
The objective lenses 1 and 2 are also driven.

Based on the subject distance information detected by the distance detecting means 24, the control means 23 controls the driving means 22 to adjust the focus by moving the lens unit L1 or L2 in the optical axis direction. . At this time, the driving unit 22 also drives the first diopter adjusting mechanism via an interlocking mechanism (not shown),
The diopter is adjusted according to the subject distance information.

The diopter adjustment according to the subject distance information may be performed continuously, or a distant view shooting, a near view shooting, a close-up shooting (macro shooting), or the like may be determined based on the subject distance information. You may go to

As the distance detecting means 24 in this embodiment, any known distance measuring means such as an active method or a passive method may be used. Further, in this example, the taking lens 20
The focus adjustment and the diopter adjustment of the first diopter adjustment mechanism are performed using the same distance detecting means 24 and driving means 22, but these may be provided separately. In this case, as the distance detecting means used for diopter adjustment of the first diopter adjusting mechanism, a means for detecting the position of a lens group for focusing, an operation unit for setting a macro shooting and a normal shooting by a photographer, and the like It may be.

[0044]

As described above, according to the present invention, the diopter when the observer looks at the subject from the finder and the diopter when the observer looks at the display frame such as the view frame in the viewfinder and the display inside and outside the view are displayed. A finder having a diopter adjustment mechanism capable of correcting diopter and a photographing apparatus using the finder can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration according to the first embodiment of the present invention;

FIG. 3 is a diagram showing a configuration according to a second embodiment of the present invention;

FIG. 4 is a diagram showing a configuration according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a configuration according to a third embodiment of the present invention.

FIG. 6 is a diagram showing a configuration according to a third embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a photographing apparatus according to the present invention.

[Explanation of symbols]

 1: Objective lens (concave lens) 2: Objective lens (convex lens) 3: Pentagonal Dach prism 4: Field lens 5: Field frame 6; Dichroic mirror 7; Eyepiece 8; Human eye 9; Index (LED light emitting element) 10; Focusing plate 11; Objective lens 12; Half mirror

Claims (11)

[Claims] 1. An observer via an objective optical system, an eyepiece optical system for observing an object image formed by the objective optical system, and at least a part of the objective optical system and the eyepiece optical system. A viewfinder having a display unit for performing the display of: a first diopter adjustment mechanism for adjusting diopter when observing the subject via the objective optical system and the eyepiece optical system; and a part of the optical system. A finder having a diopter adjustment mechanism, comprising a second diopter adjustment mechanism for adjusting diopter when observing the display unit through the display unit. 2. A finder having a diopter adjustment mechanism according to claim 1, wherein the display section is a field frame or a display inside or outside the field of view. 3. A finder having a diopter adjusting mechanism according to claim 1, wherein said finder is a real image type finder. 4. The diopter according to claim 1, wherein when the diopter is adjusted by the first diopter adjusting mechanism, the diopter when observing the display unit is constant. Viewfinder with adjustment mechanism. 5. The diopter adjustment mechanism according to claim 4, wherein the first diopter adjustment mechanism adjusts diopter by moving the eyepiece optical system and the display unit while maintaining the positional relationship between the eyepiece optical system and the display unit. A finder having the diopter adjustment mechanism described in the above. 6. The diopter adjustment mechanism according to claim 2, wherein the second diopter adjustment mechanism adjusts diopter by moving at least a part of an eyepiece optical system in an optical axis direction to change a positional relationship with respect to the display unit. A finder comprising the diopter adjustment mechanism according to any one of claims 1 to 5. 7. The diopter adjustment mechanism according to claim 1, wherein the first diopter adjustment mechanism and the second diopter adjustment mechanism can be set by a photographer himself. Viewfinder with. 8. The finder having a diopter adjusting mechanism according to claim 1, wherein the display section is not provided on a primary image forming surface of the objective optical system. 9. The finder having a diopter adjustment mechanism according to claim 1, wherein the objective optical system is a variable power optical system. 10. A finder having a diopter adjusting mechanism according to claim 9, wherein 1.0 <γ _max <3.5 when the maximum finder magnification is γ _max . 11. A photographing apparatus comprising: a finder having the diopter adjusting mechanism according to claim 1; and a distance detecting means for detecting a subject distance. According to the subject distance information, the first
An imaging device, wherein diopter adjustment is performed by a diopter adjustment mechanism.