JP2017032611A - Diopter adjustment mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which an operative pin of a diopter adjustment lens is configured to undergo spring urging in an engagement direction where the operative pin engages with a cam member, and thereby an operation load of a diopter adjustment lever varies depending upon an operation direction of the diopter adjustment lever.SOLUTION: A diopter adjustment mechanism includes: a finder optical system that is movably arranged for diopter adjustment; a movable member for driving the finder optical system; a coil spring for eliminating looseness with the movable member; and a holding member that has a flexible part restricting an operation in a vertical direction of the movable member, and urging the movable member. A sliding surface where the flexible part of the holding member slides is provided in the movable member, and the sliding surface has an inclination surface so as to make an operation load of an operation member almost even.SELECTED DRAWING: Figure 3a

Description

  The present invention relates to a viewfinder diopter adjustment mechanism.

  Conventionally, a viewfinder device of a video camera recorder has a diopter adjustment mechanism. As shown in FIG. 9, the diopter adjustment mechanism 901 proposed in Patent Document 1 includes a diopter adjustment lens 11 in the finder, and the finder for enabling the diopter adjustment lens 11 to move in the optical axis direction. In this diopter adjustment mechanism, a diopter adjustment lever 20 that is attached to the finder cabinet 1 and rotates, a cam member 17 that rotates integrally around a fulcrum shaft 19 of the diopter adjustment lever 20, and a diopter The operation pin 13 protrudes from the adjustment lens 11 and engages with the cam member 17, and the operation pin 13 of the diopter adjustment lens 11 is biased by a spring 15 in the direction of engagement with the cam member 17. .

JP-A-8-65552

  However, in the above conventional example, the operating pin 13 of the diopter adjusting lens 11 is spring-biased in the direction of engagement with the cam member 17, and the biasing force by the biasing spring is changed by the lens movement. The operation load of the diopter adjustment lever 20 changes depending on the operation direction of the lever 20, and there is a problem that the operation feeling is not good.

  A diopter adjustment mechanism according to the present invention includes a finder optical system movably disposed for diopter adjustment, a movable member for driving the finder optical system, a coil spring for removing play between the movable member, The movable member has a holding member having a flexible portion that regulates the vertical movement of the movable member and biases the movable member. The movable member is provided with a sliding surface on which the flexible portion of the holding member slides. The moving surface has an inclined surface, and the biasing force of the movable portion changes.

  According to the diopter adjustment mechanism according to the present invention, the fluctuation of the operation load of the diopter adjustment unit of the finder can be reduced, and the user can operate comfortably without feeling uncomfortable.

The perspective view which decomposed | disassembled and showed the finder of the present Example The perspective view which decomposed | disassembled and showed the optical system of the finder of a present Example Perspective view of the lower barrel of the viewfinder barrel The perspective view which looked at the lower barrel of the finder barrel from another direction Perspective view showing the inside of the lower viewfinder exterior A perspective view of the viewfinder lower exterior as seen from the outside lower side The perspective view which showed a mode that the holding member is clamping the components in connection with diopter adjustment Perspective view of the viewfinder optical system installed on the lower viewfinder exterior Front view of the main part showing an example of the contact state between the viewfinder optical system and the operating pin The perspective view which showed the operation member which operates the inside of a finder The perspective view which looked at the operation member which operates in the viewfinder from another direction Schematic showing the positional relationship between the operating pin and the operating cam during diopter adjustment of the diopter adjustment mechanism Sectional view when the viewfinder barrel is closest to the LCD (liquid crystal display) Sectional view when the viewfinder barrel is at the most distant position from the LCD (liquid crystal display) The perspective view which showed the positional relationship of the movable part of an action | operation member and a holding member when a finder barrel is approaching LCD (liquid crystal display device) The perspective view which showed the positional relationship of the movable part of an action | operation member and a holding member when a finder barrel is spaced apart from LCD (liquid crystal display device) Figure showing a conventional example

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

<First Embodiment>
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a viewfinder diopter adjusting mechanism according to the present invention will be described with reference to the drawings by taking an example in which it is applied to a viewfinder of a video camera.

  1A is an exploded perspective view of the finder 101 of this embodiment, FIG. 1B is an exploded perspective view of the optical system of the finder 101 of this embodiment, and FIG. 1C. FIG. 1D is a perspective view of the lower barrel 114 of the finder barrel 107, and FIG. 1D is a perspective view of the lower barrel 114 of the finder barrel 107 viewed from another direction. 2A is a perspective view showing the inside of the viewfinder lower exterior 103, FIG. 2B is a perspective view of the viewfinder lower exterior 103 viewed from the outside lower side, and FIG. 2C is a diopter of the holding member 128. FIG. 2 (d) is a perspective view showing a state in which the parts related to the adjustment are being clamped, FIG. 2 (d) is a perspective view in a state where the finder optical system 105 is installed in the finder lower exterior 103, and FIG. FIG. 3 is a front view of a principal part showing a contact state between a finder optical system and an operation pin when the LCD is located closest to an LCD (liquid crystal display device). FIG. 3A is a perspective view showing the operating member 123 operating in the viewfinder 101, and FIG. 3B is a perspective view of the operating member 123 operating in the viewfinder 101 seen from another direction.

  The finder 101 will be described with reference to FIGS.

  As shown in FIG. 1, the finder 101 includes a finder upper exterior 102, a finder lower exterior 103, and a finder rear exterior 104, and a finder optical system 105 is disposed inside the finder 101.

  An LCD (Liquid Crystal Display) 130 is disposed in front of the viewfinder optical system 105. An image displayed on an LCD (liquid crystal display device) 130 is enlarged through the viewfinder optical system 105 and reaches the eyes of the photographer. At this time, by moving the finder optical system 105 back and forth between the LCD (liquid crystal display device) 130 and the eyes of the photographer, the focus position of the finder optical system 105 can be varied so as to match the diopter of the photographer. The viewfinder optical system 105 has a structure movable in the optical axis direction.

  The viewfinder optical system 105 includes an optical system holding member 106 fixed to the viewfinder lower exterior 103, a viewfinder barrel 107 disposed so as to be movable in the optical axis direction via a diopter adjustment mechanism described later, and a viewfinder optical system 105. A pair of guide shafts 108 a and 108 b that are held so as to be movable in the axial direction, and a coil spring 109 that urges the finder optical system 105.

  The finder barrel 107 is fixed so that it cannot move so that the first finder lens 110, the second finder lens 111, and the third finder lens 112 are sandwiched between the upper barrel 113 and the lower barrel 114.

  Next, the diopter adjustment mechanism of the finder barrel 107 of the present invention will be described.

  A guide having circular shaft holes 115a and 115b and long hole shaft holes 116a and 116b is provided on the lower side of the lower barrel 114. An operation cam 117 is suspended from the lower surface of the lower barrel 114. Both end portions of the guide shafts 108a and 108b are press-fitted and fixed to both side bearing portions 118a, 118b, 119a and 119b at the front and rear end portions of the optical system holding member 106. The guide shaft 108a is inserted into the circular shaft holes 115a and 115b, and the guide shaft 108b is inserted into the elongated hole shaft holes 116a and 116b. Thus, the finder barrel 107 is supported so as to be movable in the optical axis direction along the guide shafts 108a and 108b. In addition, a coil spring 109 is inserted into the guide shafts 108a and 108b between one of the bearing portions 118a and 119a and the end of the lower barrel 114, thereby separating the finder barrel 107 from the LCD (liquid crystal display) 130. Energized in the direction.

  On the other hand, an operation member 123 having an operation pin 202 is disposed on the bottom surface of the finder lower exterior 103 so as to be movable in a direction perpendicular to the optical axis direction, as shown in FIG. The operating member 123 is formed with a rack shape 124 and is fitted to the operating gear 125. As shown in FIGS. 1 (a), 2 (a), and 2 (b), the operating gear 125 has an insertion hole 126 at the center, and a finder is formed by a diopter adjusting operation member 127 and a fixing member such as a screw. The lower exterior 103 is fixed so as to be rotatable. Accordingly, the operation gear 125 can be integrally rotated by the rotation operation of the diopter adjustment operation member 127, and the operation member 123 fitted by the operation gear 125 and the rack shape 124 can be operated. As shown in FIG. 2A, the operating range of the actuating member 123 is regulated within a range within the operation regulating portions 201a and 201b formed in the finder lower exterior 103, and the end of the actuating member 123 comes into contact. The operation of the diopter adjustment operation member 127 is stopped.

  The members related to the diopter adjustment operation are sandwiched between the viewfinder lower exterior 103 and the holding member 128 as shown in FIG. Further, the flexible portion 129 provided on the holding member 128 is in contact with the sliding surface 301 disposed on the operating member 123 so as to charge, and the operating member 123 is pressed by the pressing force generated by the deflection of the movable portion 129. Is pressed against the viewfinder lower exterior 103 to generate an operation load during diopter adjustment operation.

  As shown in FIG. 2D, the viewfinder optical system 105 is provided with an operation cam 117 of the lower barrel 114 on the operation pin 202 of the operation member 123 with respect to the viewfinder lower exterior 103 in the state shown in FIG. It is attached to engage. At this time, as shown in FIG. 2 (e), the operating pin 202 is attached so as to contact the operating cam 117 by the pressing force of the coil spring 109.

  The configuration of the operating member 123 will be described with reference to FIG.

  In addition to the above-described operating pin 202, rack shape 124, and sliding surface 301, the operating member 123 fits and slides on the finder lower exterior 103 and slides on the finder lower exterior 103. The rib 303 is configured. The sliding surface 301 on the side of the operating member 123 on which the movable portion 129 of the holding member 128 slides has a low sliding surface 304, a high sliding surface 305, so as to have a height difference in the operating direction of the operating member 123. It has an inclined surface 306 that connects between the low sliding surface 304 and the high sliding surface 305. The bendable portion 129 of the holding member 128 slides on the low place sliding surface 304, the high place sliding surface 305, and the inclined surface 306, so that the bend amount of the bendable portion 129 changes, and the load generated by the bend is changed. It becomes possible to increase or decrease.

  An operation at the time of diopter adjustment of the diopter adjustment mechanism configured as described above will be described.

  4 is a schematic diagram showing the positional relationship between the operating pin 202 and the operating cam 117 when the diopter is adjusted by the diopter adjusting mechanism when cut along the XX section of FIG. 2 (e), and FIG. 5 is a viewfinder mirror. FIG. 6 is a cross-sectional view when the tube 107 is at a position closest to the LCD (liquid crystal display device) 130, and FIG. 6 is a cross-sectional view when the viewfinder barrel 107 is at a position farthest from the LCD (liquid crystal display device) 130. .

The positional relationship between the operating pin 202 and the operating cam 117 when the finder barrel 107 is approaching an LCD (liquid crystal display) 130 (FIG. 5) is as shown by a solid line in FIG. At this time, the actuating pin 202 of the actuating member 123 comes into contact with the point a of the actuating cam 117 of the finder lower exterior 103 by the lower barrel 114 being pushed by the pressing force (F _C ) received from the compressed coil spring 109. Yes.

  From this state, when the operating gear 125 connected by rotating the diopter adjustment operating member 127 is rotated clockwise (direction of arrow A in FIG. 2A), the operating pin 202 of the operating member 123 is moved to the operation restricting portion 201b. The point b of the operating cam 117 contacts the operating pin 202 as indicated by the phantom line. At this time, the finder barrel 107 moves to a position (FIG. 6) that is the farthest from the LCD (liquid crystal display device) 130.

  The viewfinder barrel 107 receives the pressing force generated when the compressed coil spring 109 returns to its original length, and moves while maintaining contact with the operating pin 202.

  At this time, the actuating cam 117 located at the solid line position by the horizontal movement of the actuating member 123 moves to the imaginary line position, translates only by the cosine component of the angle α of the actuating cam 117, and the finder barrel 107. Can be moved to the most advanced position along the guide shafts 108a and 108b.

  Further, the finder column 107 is moved to the LCD (liquid crystal display device) by rotating the operating gear 125 connected by rotating the diopter adjusting operation member 127 in the counterclockwise direction (direction of arrow B in FIG. 2A). ) It is possible to move in a direction approaching 130.

  In this way, the viewfinder barrel 107 can be adjusted in the optical axis direction via the operation pin 202 of the operation member 123 by the rotation operation of the operation gear 125 by the diopter adjustment operation member 127.

  Subsequently, an operation load at the time of diopter adjustment of the diopter adjustment mechanism will be described.

  FIG. 7 is a perspective view showing the positional relationship between the actuating member 123 and the movable portion 129 of the holding member 128 when the finder barrel 107 is approaching an LCD (liquid crystal display) 130, and FIG. 8 is a viewfinder barrel 107. FIG. 6 is a perspective view showing a positional relationship between the actuating member 123 and the movable portion 129 of the holding member 128 when is spaced apart from the LCD (liquid crystal display device) 130.

The operation load (F ₀ ) during diopter adjustment of the diopter adjustment mechanism is defined as a load (F _C ) generated by the coil spring 109 and a load (F _P ) generated by the flexible portion 129 of the holding member 128.
_{F 0 = f (F C)} + g (F P) ( Equation 1)
Can be expressed as f _{(F C)} is a function of _{F C,} g _{(F P)} is a function of _{F P.}

As shown in FIG. 5, when the finder barrel 107 is approaching an LCD (liquid crystal display) 130, the coil spring 109 is compressed by the finder barrel 107, and the load (F _C ) becomes the maximum within the range of diopter adjustment.

On the other hand, as shown in FIG. 7, the movable portion 129 of the holding member 128 is located on the lower sliding surface 304 of the actuating member 123, so that the load (F _P ) generated at the movable portion 129 is Minimum within the range of diopter adjustment. In this state, since the load (F _C ) generated by the coil spring 109 is received via the operation cam 117 of the finder lower exterior 103, the load (F _P ) does not move the operation member 123 due to the load (F _C ). It is set to such a load.

As shown in FIG. 8, when the finder barrel 107 is separated from the LCD (liquid crystal display) 130, the coil spring 109 is extended by the finder barrel 107, and the load generated by the coil spring 109. (F _C ) is minimum within the range of diopter adjustment.

Maximum other hand, since the variable橈部129 of the holding member 128 is positioned in low-income sliding surface 304 of actuating member 123, generated in a soluble橈部129 _{(F P)} is in the range of diopter adjustment It becomes. In this state, since the load (F _C ) generated by the coil spring 109 urging the finder lower exterior 103 is minimized, the load (F _C ) can press the operating cam 117 of the finder barrel 107 against the operating pin 202. It is set to a load that can be done.

While the finder barrel 107 is moving from a position close to the LCD (liquid crystal display device) 130 to a position away from the LCD (liquid crystal display device) 130, the movable portion 129 of the holding member 128 is inclined on the inclined surface 306 of the operating member 123. Operate to slide on surface 306. At that time, the inclined surface 306 is such that the load (F _C ) generated by the coil spring 109 and the load (F _P ) generated by the flexible portion 129 are such that the operation load (F ₀ ) shown in Equation 1 is substantially constant. It is set to be. With this configuration, the operation load of the diopter adjustment operation member 127 can be kept substantially constant regardless of the displacement of the movable portion 129 and the displacement of the coil spring 109, and the user does not feel a sense of discomfort. You can operate comfortably.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. A part of the above-described embodiments may be appropriately combined.

101 finder, 103 finder lower exterior, 105 finder optical system,
109 coil spring, 114 lower barrel, 117 operating cam, 123 operating member,
128 holding members, 129 flexible parts, 202 operating pins, 301 sliding surfaces,
304 Low sliding surface, 305 High sliding surface, 306 Inclined surface

Claims (1)

A finder optical system movably arranged for diopter adjustment, a movable member for driving the finder optical system, a coil spring for removing backlash from the movable member, and the vertical movement of the movable member A holding member having a flexible portion that biases the movable member, and the movable member is provided with a sliding surface on which the flexible portion of the holding member slides. A diopter adjustment mechanism having an inclined surface and changing the biasing force of the movable portion.