JP4862672B2 - Imaging device having an electric view finder device - Google Patents

Description

  The present invention relates to a digital still camera, a video movie, and the like equipped with an electric view finder device (hereinafter referred to as EVF) capable of adjusting diopter.

  Many digital still cameras and video movies are equipped with EVF. EVF captures light entering from a lens with an image sensor such as a CCD, converts it into image data, and displays it on an image display surface such as a liquid crystal of a viewfinder. With a field of view rate of almost 100%, you can see the image you want to shoot, and the back LCD can easily check the image even in bright outdoors under sunlight with poor visibility. It is often installed in still cameras and video movies.

  And many EVFs have a diopter adjustment mechanism that allows even a person with myopia, hyperopia, presbyopia and the like to adjust the finder focus with the naked eye. The diopter adjustment method is generally performed by moving the lens unit in the EVF back and forth.

  Next, a conventional EVF will be described with reference to the drawings. FIG. 1 is a perspective view of a digital still camera equipped with EVF. FIG. 10 is a diagram showing the configuration of the EVF in the conventional example, FIG. 11 is an exploded view of the EVF in the conventional example, and FIG. 12 is a detailed view of the back side of the diopter adjustment dial of the EVF in the conventional example. It is configured radially. As shown in the figure, this cross section is composed of an inclined surface in which the tops and valleys are alternately continued.

  In the conventional EVF, as shown in FIG. 11, a fitting pin 107-a is disposed on the back side surface of the diopter adjustment dial 107, and the fitting pin 107-a penetrates through the body case hole 108, and the lens. The unit is inserted into the unit fitting groove 101-b. Here, by rotating the diopter adjustment dial 107, the lens unit 101-a can be moved in the left-right direction in FIG.

  A coil spring 105 is inserted into the coil attachment hole 102-a (FIG. 11) of the dial attachment portion, and a steel ball 106 is further mounted thereon, and a steel ball is placed in the concave and convex groove 107-b on the back surface of the diopter adjustment dial 107. 106 is pressed by the urging force from the coil spring 105. Here, when the diopter adjustment dial 107 is rotated, the steel balls 106 urged by the coil spring 105 sequentially climb over the top portion on the inclined surface in which the top portion and the trough portion are alternately arranged on the back surface, A click force is generated, and the lens unit position (diopter) is fixed at discrete positions.

  The observation window 104 is ultrasonically welded to the standing wall 102-a of the case.

The EVF having the diopter adjustment mechanism as described above is disclosed in Patent Document 1.
JP-A-6-70205

  However, in the above conventional method, the coil spring 105 and the steel ball 106 are attached to the main body 102 at the time of EVF assembly, and the diopter adjustment dial 107 must be attached in a state where the coil spring 105 and the steel ball 106 are not visible. The pin 107-a of the diopter adjustment dial must be inserted into the groove 101-b of the lens unit after passing through the main body case hole 108 without being visible.

  In addition, since the position of the lens unit can be fixed only at discrete positions by giving a click feeling, the user adjusts his diopter to the diopter determined by the recess on the back of the diopter adjustment dial. There must be.

  Furthermore, since the coil spring 105 is housed in a limited space on the back of the diopter adjustment dial, there is no free height in the length direction, and the spring constant increases, so even a small dimensional variation causes a difference in urging force and stability. Torque is not obtained.

  Further, the conventional configuration has a sliding surface between the steel ball 106 and the resin, which requires sliding with grease. The grease is remarkably changed in properties due to temperature changes, and induces torque fluctuations due to changes in outside air temperature.

  In addition, since the coil spring force works in the direction in which the diopter adjustment dial 107 comes off, the diopter adjustment dial 107 requires a robust means for preventing removal such as a screw, and even if it is fixed with a screw, The screw may come loose as you turn the dial.

  In addition, when attaching the inspection window 104, ultrasonic welding requires a lot of man-hours and welding equipment and jigs. Further, since the internal diaphragm 103 forms the standing wall 102-a in the case, the internal diaphragm 103 cannot be integrated with the case 102 because of the drawing direction of the case mold, and is a separate part. There is a problem such as, and the solution is demanded.

  Therefore, the present invention satisfies the above-described demands, and an object of the present invention is to provide an EVF that can realize assemblability improvement, man-hour reduction, and stable torque management by stepless diopter adjustment.

In order to solve the above problems, an EVF according to the present invention has a lens unit configured to be movable in the optical axis direction, a diopter adjustment dial provided rotatably, and a diopter adjustment dial. It is provided with dial biasing means for adding lateral pressure from substantially vertical direction, and a dial Kosudo portion disposed diopter adjusting dial mounting portion and the rotation axis.

  In addition, the observation window has a structure that can be attached with one-touch by nail fitting, and the diaphragm portion, which has been a separate part of the past, is integrated with the main body case.

  In the EVF of the present invention, the diopter adjustment is stepless, has a stable dial torque, can reduce the number of parts and man-hours, and can improve workability.

  The best mode for carrying out the EVF of the present invention will be described with reference to FIGS.

(Embodiment 1)
Configuration First, the assembly method will be described with reference to FIG. Details of each part of FIG. 4 are shown in FIGS.

  First, the lens unit 2 is attached to the main body case 3. When the lens unit 2 is attached, the lens unit fitting groove 2-b is placed on the upper side, and the protruding portion 2-c is inserted so as to fit the main body case groove portion 3-d (FIG. 8). The combination of the protruding portion 2-c and the main body case groove portion 3-d is similarly configured on the lower side as can be seen from FIG.

  Thereafter, the observation window 4 is attached to the main body case 3 by nail fitting.

  Next, the leaf spring 6 is attached. At this time, the first handle 6-a is grasped and attached by claw fitting.

  Then, the diopter adjustment dial 5 is attached. When attaching the diopter adjustment dial 5, the leaf spring 6 is temporarily bent in the left direction in FIG. 2 by holding the second handle portion 6-b of the leaf spring, and the diopter adjustment dial fitting pin 5-b. Is aligned so that the lens enters the lens unit fitting groove 2-b.

2. FIG. 1 is a perspective view of a digital still camera equipped with an EVF. 2 is a diagram showing a configuration of the EVF according to the embodiment of the present invention, FIG. 3 is a sectional view thereof, and FIG. 4 is an exploded view thereof. 5 is a cross-sectional view of the vicinity of the diopter adjustment dial after the diopter adjustment dial is attached, FIG. 6A is a detailed view of the diopter adjustment dial attachment portion of the main body case, and FIG. 6B is a view of the main body case. It is a figure showing the positional relationship of the lens unit pushed into the degree adjustment dial attachment part and the innermost end. FIG. 7 is a detailed view of a diopter adjustment dial for EVF according to the first embodiment of the present invention, and FIG.

  In the EVF of the present invention, an arc-shaped hole 3-f is disposed on the inner periphery of the diopter adjustment dial mounting portion of the main body case 3, and the diopter adjustment dial fitting pin 5-b provided on the diopter adjustment dial 5 is provided. The tip is configured to pass through this arc-shaped hole and fit into the lens unit fitting groove 2-b. Then, the diopter adjustment dial fitting pin 5-b is moved by rotating the diopter adjustment dial 5, and the lens unit 2 is moved in the left-right direction in FIG. 3 along the virtual image optical axis in conjunction therewith. It has become.

  An outline of the EVF of the present invention will be described with reference to FIGS.

  The EVF of the present invention includes a leaf spring 6, a diopter adjustment dial 5 that contacts the leaf spring 6, and a main body case 3, and a case circumferential rib 3-b that is a molded product and a rib 5-a inside the dial that is a molded product. Are in line contact at multiple locations. By applying a side pressure to the diopter adjustment dial 5 by the leaf spring 6, friction is caused by line contact between the tops of the plurality of ribs 5-a and the outer periphery of the case circumferential rib 3-b at a plurality of locations near the pressing portion. It has occurred. Since the leaf spring 6 has a sufficient beam length and a small spring constant, it is easy to manage the spring load. For this reason, it is possible to suppress variations in lateral pressure applied to the diopter adjustment dial 5, and the torque is stabilized. It is also possible to finely adjust the torque by changing the shape of the contacting rib.

  Here, the diopter adjustment dial 5 has a smooth outer peripheral surface on which the leaf spring 6 slides. This makes the diopter adjustment stepless, and the user can adjust the diopter to the optimum diopter for himself.

  The leaf spring 6 is located adjacent to the diopter adjustment dial 5 mounting portion. As a result, the leaf spring 6 is not hidden behind the diopter adjustment dial 5, so that the visibility is good and one part can be attached in one operation, so that the workability is improved.

  The leaf spring 6 has a first handle portion 6-a. As shown in FIG. 2, the first handle 6-a is formed by bending the end of the leaf spring 6, and the edge of the leaf spring 6 does not appear on the front side in FIG. Since the spring 6 can be safely and easily operated without touching the corner of the leaf spring when the spring 6 is inserted into the main body case 3, workability is improved. At the same time, the flexible board including the wiring of the circuit board formed around the EVF is not damaged.

  The leaf spring 6 has a second handle portion 6-b. As a result, the work of temporarily bending the leaf spring 6 to attach the diopter adjustment dial 5 is facilitated, and the workability is improved.

  The main body case 3 has a protrusion 3-c. In FIG. 2, when the diopter adjustment dial 5 is assembled, the leaf spring 6 is deflected to the left side of the drawing. However, if it is excessively deflected, the elastic limit is exceeded, and the diopter adjustment dial 5 is appropriate. Therefore, excessive bending when the leaf spring 6 is temporarily bent can be prevented, and the leaf spring 6 can be prevented from being bent due to an operation error. Prevent plastic deformation.

  The position of the main body case 3 is determined by the end surface of the lens unit protrusion portion 2-c coming into contact with the innermost end of the main body case groove portion 3-d when the lens unit 2 is pushed into the innermost position. FIG. 6B shows the relationship, and the lens unit fitting groove 2-b is positioned in the vicinity of the left end of the main body case hole portion 3-f (near the main body case guide portion 3-e). is there. At this time, the phase relationship is such that the end face of the diopter adjustment dial guide rib 5-c shown in FIG. 7 contacts the end face of the main body case guide portion 3-e shown in FIG. Accordingly, when the diopter adjustment dial 5 is incorporated into the main body, the diopter adjustment dial 5 is restricted counterclockwise as viewed from the outside in the assembling direction, and the diopter adjustment dial guide rib 5-c is inserted along the guide 3-e. Thus, even if the lens unit fitting groove 2-b is not visible, the diopter adjustment dial fitting pin 5-b can be easily inserted into the lens unit fitting groove 2-b, and the workability is improved.

  The side surface of the lens unit 2 is a plane, and the fitting groove 2-b is stepped down from the side plane (FIG. 4). As a result, even if the diopter adjustment dial fitting pin 5-b fails to be inserted into the lens unit fitting groove 2-b, the diopter adjustment dial fitting pin 5-b is rotated naturally in an arbitrary direction. Since it can be dropped into the groove, workability is improved. In the conventional EVF apparatus shown in FIG. 11, since the lens unit fitting groove 101-b has a step on the outside thereof, the phase adjustment of the diopter adjustment dial 107 fails and the diopter adjustment dial fitting pin 107-a. If the tip comes in contact with the outside of the step, it is very difficult to restore the correct phase.

  The leaf spring 6 has a dial pressing portion 6-c (FIG. 4). In the present invention, since the force does not act in the direction in which the diopter adjustment dial 5 comes out, the dial presser 6-c can sufficiently prevent the diopter adjustment dial 5 from coming off. Therefore, the screw fixing work of the diopter adjustment dial 5 can be abolished, and the number of parts and man-hours can be reduced.

  Next, the EVF according to the present invention has a convex portion 3-g in the main body case 3, and has an inspection window 4 having a hooking portion 4-a that is locked to the convex portion. Thereby, the three inspection windows 4 are attached to the main body case 3 with one touch by the principle of snap fit. At this time, the observation window 4 is in contact with the main body case from the inside by the protrusion 4-b, and does not rattle after being attached. This relationship is shown at the right end of the cross-sectional view shown in FIG. This eliminates the need for ultrasonic welding, thereby reducing the equipment, jigs and man-hours for welding. In addition, since there is no need to form a standing wall for ultrasonic welding, the cabinet side and the core side of the case molding die are reversed, and the throttle part, which has been a separate part of the past, is integrated with the main body case. The number of points and man-hours will be reduced.

(Embodiment 2)
As described above, the present invention can be realized by the first embodiment. However, various other embodiments of the present invention are conceivable. Accordingly, various other embodiments of the present invention will be described together as a second embodiment.

  In the first embodiment, the case circumferential rib 3-b and the rib 5-a inside the dial, which is a molded product, are brought into line contact at a plurality of locations to generate a frictional force. However, the rib 5-a is not necessarily provided inside the diopter adjustment dial, and may be provided on the outer peripheral portion of the main body case circumferential rib 3-b.

  In the first embodiment, the dial pressing portion 6-c of the leaf spring 6 is provided to prevent the diopter adjustment dial 5 from coming off. However, due to the characteristics of the present invention, the dial 5 can be prevented from coming off sufficiently by being lightly fixed, so the method is not limited to this. For example, as shown in FIG. 9, the diopter adjusting dial mounting shaft 3-h may be configured in several lockable shapes, and the dial 5 may be fixed to the main body case 3 by the principle of snap fit.

In the first embodiment, the leaf spring 6 is used, and the case circumferential rib 3-b, which is a molded product, and the rib 5-a inside the dial, which is a molded product, are brought into line contact at a plurality of locations to generate frictional force. It was generated.
This is particularly effective because the friction between the molded products is great because of the contact between the molded products, but it is not always necessary to bring the molded products into contact with each other, and it is possible to generate friction by contacting other members. Further, it is not always necessary to make a line contact or to make contact with a rib, and it is possible to generate friction in a shape conforming thereto.

  In the present invention, an EVF having a diopter adjustment dial with a stable torque can be assembled with a small number of parts and man-hours, so that it is particularly effective for a digital still camera and a video movie. In addition, it is effective for a device having a mechanism for moving a lens by turning a dial with an optical device.

Perspective view of camera equipped with EVF The figure which shows the structure of EVF in Embodiment 1 of this invention Sectional drawing of the structure of EVF in Embodiment 1 of this invention Exploded view of EVF in Embodiment 1 of the present invention Sectional drawing of the diopter adjustment dial vicinity after attaching the diopter adjustment dial of EVF in Embodiment 1 of this invention (A) Detailed view of the diopter adjustment dial attachment portion of the EVF main body case according to Embodiment 1 of the present invention (b) The diopter adjustment dial attachment portion of the EVF main body case according to Embodiment 1 of the present invention and the farthest end Diagram showing the positional relationship of the pushed lens unit Detailed view of the diopter adjustment dial of EVF in Embodiment 1 of the present invention Detail of main body case of EVF in Embodiment 1 of the present invention The figure which shows the example of the EVF attachment axis | shaft in Embodiment 2 of this invention The figure which shows the structure of EVF in a prior art example Exploded view of EVF in the conventional example Detailed view of the back side of the EVF diopter adjustment dial in the conventional example

Explanation of symbols

2 Lens unit 3 Body case 3-b Body case circumferential rib 5 Diopter adjustment dial 5-b Diopter adjustment dial fitting pin 6 Leaf spring

Claims (5)

An imaging apparatus having an electronic viewfinder,
A lens unit configured to be movable in the optical axis direction in the electronic viewfinder;
A diopter adjustment dial provided to be rotatable with respect to the diopter adjustment dial mounting portion ;
Dial biasing means for applying a lateral pressure from a direction substantially perpendicular to the rotation axis to the diopter adjustment dial;
A dial rubbing portion disposed on the diopter adjustment dial mounting portion;
A first interlocking portion is disposed on the lens unit, and a second interlocking portion is disposed on the diopter adjustment dial. Interlocking the lens unit, the lens unit translates in the optical axis direction,
The dial biasing means the diopter adjustment to that imaging device adds lateral pressure in the direction of pressing the dial the dial Kosudo unit. The diopter adjustment dial has an arc-shaped inner surface rubbing portion having a radius smaller than the outer peripheral radius, and the dial rubbing portion has a shape of the outer peripheral portion that is larger than the radius of the inner surface rubbing portion. the imaging apparatus according to 請 Motomeko 1 Ru circular der to the small dimensions and radius. The imaging apparatus according to 請 Motomeko 2 that having a plurality of projections on said inner surface Kosudo unit. The dial Kosudo section imaging apparatus according to 請 Motomeko 2 that having a plurality of projections on its outer periphery. The dial biasing means, the imaging apparatus according to any one of 請 Motomeko 1 to 4 that consists of a leaf spring.

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