JPH0726836U - Focus food - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a focus hood which is excellent in portability, light shielding property and operability. The focus hood 10 includes a hood frame 12 that is attachable to and detachable from a field camera, a reflector 13 that reflects an object image formed on a focus surface upward by 90 degrees, and a side of the reflector 13 that shields light. A pair of horizontal blades 14 and the reflector 1
From the upper lid 15 which shields the upper part of 3 and to which the eyepiece loupe 11 is attachable / detachable, the rear reflector 17 which is formed by the reflector 13 in the open state, the pair of lateral blades 14 and the upper lid 15 and which is closed It is configured. When storing, reflector 1
3, The pair of horizontal blades 14 and the upper lid 15 are closed inside. Thereby, the focus hood 10 has a thin shape,
Easy to carry. The surroundings are shielded from light by the reflection plate 13, the pair of horizontal blades 14, the upper lid 15, and the rear lid 17.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a focus hood that guides a subject image formed on a focus surface of a field camera to an eyepiece loupe.

[0002]

[Prior art]

 A conventional focus hood of this type is shown in FIGS. 8 and 9.

A focusing hood 1A shown in FIG. 8 has a reflecting plate 2 which is inclined by 45 degrees with respect to the focusing surface of a field camera (not shown). It has a box structure in which the eyepiece 5 is attached to the light-shielding plate 3 that covers it.

In the focus hood 1B shown in FIG. 9, a hood frame 6 is provided with a lid 7 that can be opened and closed up to an opening angle of 90 degrees, a light shielding member 8 made of cloth or the like is provided on the lid 7, and the lid 7 is closed. It is an opening and closing type in which the light shielding member 8 can be stored inside the lid 7.

[0005]

[Problems to be solved by the device]

 However, since the focus hood 1A shown in FIG. 8 has a box structure and can completely shield light, it is inconvenient to carry because it has a structure that cannot be folded.

The focus hood 1B shown in FIG. 9 is easy to carry because it has a foldable structure. However, external light is incident on the focus surface from behind and the subject image cannot be viewed brightly. There is.

Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a focus hood having excellent portability, light-shielding properties, and operability.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the focus hood according to claim 1 is a pin hood that reflects an object image formed on a focus surface of a field camera upward by 90 degrees and guides it to an eyepiece loupe, and corresponds to the focus surface. A hood frame that has an opening and is detachable from the field camera, a substantially rectangular reflector that is openably and closably supported at the bottom of the hood frame and reflects the image of the object, and the reflector is opened in the opening direction. The first urging member for urging the hood frame and the hood frame are supported on both sides of the hood frame so as to be openable and closable up to an opening angle of 90 degrees, and substantially coincide with the sides of the reflection plate with the reflection plate opened at 45 degrees. A pair of trapezoidal lateral blades having inclined sides, a second biasing member for biasing the pair of lateral blades in the closing direction, and an opening angle of the reflection plate provided on the inclined sides of the pair of lateral blades. And a regulation unit that regulates The upper lid of the hood frame is supported so that it can be opened and closed up to an opening angle of 90 degrees, and a substantially rectangular upper lid to which the eyepiece loupe can be attached and detached in an opening provided in the center, and the upper lid that urges the upper lid in the opening direction. The biasing member 3 and the reflector plate that is rotatably supported on the rear end side of the upper lid and is rotated downward by opening the upper lid 90 degrees, the pair of horizontal blades, and And a rear lid that closes a rear opening formed by the upper lid.

The focus hood according to claim 2 has a fixing mechanism capable of fixing the upper lid side to the hood frame with the reflector, the pair of lateral blades and the upper lid being closed.

Further, in the focus hood according to the third aspect, the urging force of the first urging member is made larger than the urging force of the second urging member.

[0011]

[Action]

 According to the focus hood of the first aspect, when the focus hood is stored, the reflector, the pair of lateral blades and the upper lid are closed inside. As a result, the focus hood has a thin shape and is easy to carry. When using, the reflector, the pair of lateral blades and the upper lid are opened by the urging forces of the first to third urging members, the rear lid is rotated downward, and the eyepiece loupe is attached to the upper lid, and the hood is attached. Attach the frame to the field camera. In addition, the periphery is shielded from light by the reflector, the pair of horizontal blades, the upper lid and the rear lid.

According to the focus hood of the second aspect, the reflector, the pair of lateral blades and the upper lid are closed in this order, and in this state, the upper lid side is fixed to the hood frame by the fixing mechanism. This makes it easier to carry.

According to the third aspect of the present invention, when the reflecting plate is closed inside against the urging force of the first urging member, the pair of lateral blades are urged by the urging force of the second urging member. Close inside. Therefore, after the reflector is closed inside, the reflector, the pair of lateral blades, and the top lid can be housed in the hood frame side by two operations of closing the top lid inside. In addition, the fixing mechanism releases the fixation of the upper lid and the upper lid can be opened by one operation to open the reflector, the pair of lateral blades, and the upper lid.

[0014]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the focus hood of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG.

The focus hood 10 of the present embodiment reflects an object image formed on the focus surface of a field camera (not shown) upward by 90 degrees and guides it to the eyepiece loupe 11, and is a hood detachable from the field camera. The frame 12, the reflection plate 13 that reflects the subject image formed on the focus surface upward by 90 degrees, the pair of horizontal blades 14 that shields the sides of the reflection plate 13, and the upper part of the reflection plate 13 that shields light. At the same time, the eyepiece loupe 11 is made up of a removable upper lid 15, a reflector 13 in an open state, a rear lid 17 for closing a rear C opening 16 formed by the pair of lateral blades 14 and the upper lid 15 and the like. 1 and 2, reference numerals 26 and 27 respectively represent a fulcrum shaft and an opening / closing claw for mounting the focus hood 10 on the field camera.

The reflection plate 13 has a mirror 131 bonded to the inside of a rectangular inclined plate 130. The inclined plate 130 is supported on the lower part of the hood frame 12 so as to be openable and closable by a hinge structure having a lower shaft 18. The inclined plate 130 is urged in the opening direction by a first urging member 19 such as a torsion spring arranged on the lower shaft 18.

The horizontal blades 14 are supported on both sides of the hood frame 12 so as to be openable and closable up to an opening angle of 90 degrees by a hinge structure having a lateral shaft 20. Further, the horizontal blade 14 is formed in a trapezoidal shape having an inclined side 14a which substantially coincides with the side 13a of the reflection plate 13 when the reflection plate 13 is opened 45 degrees. By bending the inclined side 14a of the horizontal blade 14 inward, a restriction portion 14b for restricting the opening angle of the reflection plate 13 to 45 degrees is formed. The lateral blades 14 are urged in the closing direction by a second urging member 21 such as a torsion spring arranged on the side shaft 20. The spring force of the second biasing member 21 is smaller than the spring force of the first biasing member 19. As a result, when the reflecting plate 13 is closed inward against the spring force of the first biasing member 19, the pair of horizontal blades 14 does not press it by hand, and the spring force of the second biasing member 21 is not pressed. Will close it inward.

The upper lid 15 is a substantially rectangular shape which is supported on the upper part of the hood frame 12 by a hinge structure having an upper shaft 22 so as to be openable and closable up to an opening angle of 90 degrees, and has an opening at the center. A portion 15a, a holding mechanism 23 for holding the eyepiece loupe 11 around the portion 15a, and a rear lid holding pin 15b on the rear side are provided. Further, the upper lid 15 is urged in the opening direction by a third urging member (see FIG. 5, which will be described later) 24 such as a torsion spring arranged on the upper shaft 22.

As shown in FIG. 4, the holding mechanism 23 of the upper lid 15 is provided with a pair of headed pins 23a for pressing the collar portion 11a of the eyepiece loupe 11 and a position facing the pair of headed pins 23a. A stepped pressing member 23c is provided which presses the eyepiece loupe 11 inward by a coil spring 23b. When the eyepiece loupe 11 is attached by this holding mechanism 23, the pressing member 23c is moved in the direction of the arrow shown in the figure, and the collar portion 11a of the eyepiece loupe 11 is held by the pair of headed pins 23a and pressed. Release your hand from member 23c. As a result, the eyepiece loupe 11 is held by the pressing force of the coil spring 23b. When the eyepiece loupe 11 is removed, it can be easily removed by moving the pressing member 23c in the direction of the arrow shown in the figure.

The rear lid 17 has a slanted long hole 17 a for fitting the rear lid holding pin 15 b on one end side, and a fixing mechanism 2 for fixing the upper lid 15 to the hood frame 12 on the other end side. 5 is provided. By forming the elongated hole 17a in an inclined manner, when the upper lid 15 is biased in the opening direction by the third biasing member 24, the rear lid 17 can be rotated downward by the impact force and its own weight. It will be possible. The fixing mechanism 25 includes a fixing knob 25a exposed to the outside and a fixing knob 25b fixed to the fixing knob 25a and exposed to the outside by a leaf spring. When the rear lid 17 is closed, the fixing pawl 25b is locked in the recess 12b provided inside the lower portion of the hood frame 12 so that the rear lid 17 can be fixed.

Next, an example of the handling method of this embodiment will be described with reference to FIGS. 5 is a perspective view showing a storing process, FIG. 6 is a perspective view showing a stored state, and FIG. 7 is a sectional view taken along line D-D in FIG.

To fold and store each part from the state shown in FIG. 1, first, as shown in FIG. 5, the rear lid 17 is raised to be horizontal with the upper lid 15, and the spring force of the first biasing member 19 is applied. When the reflection plate 13 is closed inwardly, the pair of horizontal blades 14 are closed inward by the spring force of the second biasing member 21. Next, the upper lid 15 is closed inward, and the fixing knob 25a of the fixing mechanism 25 of the rear lid 17 is operated to lock the fixing pawl 25b in the recess 12b provided inside the lower portion of the hood frame 12. As described above, by performing the operation twice, the focus hood 10 becomes thin as shown in FIGS. 6 and 7.

Next, in the case of opening from the stored state shown in FIGS. 6 and 7, when the fixing knob 25a of the fixing mechanism 25 of the rear lid 17 is operated to release the fixing of the upper lid 15, the third lid is opened. The spring force of the biasing member 24 opens the upper lid 15, the spring force of the second biasing member 21 opens the pair of lateral blades 14, and the spring force of the first biasing member 19 opens the reflector plate 13. Ku. Further, when the upper lid 15 is opened and becomes horizontal, the rear lid 17 rotates downward due to the impact force and its own weight. That is, it can be used with one operation. Subsequently, the eyepiece loupe 11 is attached to the upper lid 15, and the hood frame 12 is attached to a field camera (not shown).

According to this embodiment, since the storage state is thin, it is easy to carry, and since the fixing mechanism 25 can fix the upper lid 15 side to the hood frame 12, it is easier to carry. Becomes In addition, the rear lid 17 blocks not only the upper and side portions but also the rear portion to improve the light-shielding property, so that outside light does not enter the focusing surface of the field camera, and the subject image can be seen brightly. You can In addition, since it can be stored by two operations and can be used by one operation, operability is improved. Further, the holding mechanism 23 allows the eyepiece loupe 11 to be easily attached and detached.

The present invention is not limited to the above embodiment, and various modifications can be made.

[0027]

[Effect of device]

 As described above in detail, the present invention has the following effects.

According to the first aspect of the present invention, since it has a thin shape when it is stored, it is easy to carry and can be opened and closed by a simple operation so as to shield not only the upper and side portions but also the rear portion. Therefore, it is possible to provide a focus hood which is excellent in portability, light shielding property and operability.

According to the second aspect of the invention, since the upper lid side can be fixed to the hood frame by the fixing mechanism, it becomes easier to carry.

According to the third aspect of the present invention, since it can be stored by two operations and can be used by one operation, the operability is further improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a focus hood of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

FIG. 4 is a sectional view of a holding mechanism according to the present embodiment.

FIG. 5 is a perspective view showing a storing process of the present embodiment.

FIG. 6 is a perspective view showing a stored state of the present embodiment.

FIG. 7 is a sectional view taken along line DD in FIG.

FIG. 8 is a perspective view of a conventional focus hood.

FIG. 9 is a perspective view of a conventional focus hood.

[Explanation of symbols]

 10 Focus Hood 11 Eyepiece Loupe 12 Hood Frame 12a Hood Opening 13 Reflector 13a Side of Reflector 14 Side Blade 14a Side Edge of Side Blade 14b Restriction Part 15 Top Lid 15a Top Lid Opening 17 Back Lid 19 1st Biasing member 21 second biasing member 24 third biasing member 25 fixing mechanism

Claims (3)

[Scope of utility model registration request] 1. A focus hood which reflects an object image formed on a focus surface of a field camera by 90 degrees upward and guides it to an eyepiece loupe, having an aperture corresponding to the focus surface and being attachable to and detachable from the field camera. Hood frame,
A substantially rectangular reflecting plate that is openably and closably supported at the lower part of the hood frame to reflect the subject image, a first urging member that urges the reflecting plate in the opening direction, and both side parts of the hood frame. A pair of trapezoidal side blades each having an inclined side substantially corresponding to a side of the reflection plate and a pair of the side blades are closed while the reflection plate is opened and closed by 90 degrees and the reflection plate is opened by 45 degrees. A second urging member that urges in a direction, a restricting portion that is provided on the inclined sides of the pair of horizontal blades and that restricts the opening angle of the reflecting plate to 45 degrees, and an opening angle 90 at the top of the hood frame.
Up and down, a substantially rectangular upper lid to which the eyepiece loupe can be attached and detached in an opening provided in the center, a third urging member that urges the upper lid in the opening direction, and the upper lid. When the upper lid is rotatably supported on the rear end side and the upper lid is rotated 90 degrees downward, the rear opening formed by the reflector, the pair of horizontal blades, and the upper lid is opened by rotating the upper lid downward. A focus hood, comprising: a rear cover that closes. 2. The focus hood according to claim 1, further comprising a fixing mechanism capable of fixing the upper lid side to the hood frame with the reflector, the pair of lateral blades and the upper lid closed. 3. The biasing force of the first biasing member is applied to the second biasing member.
The focus hood according to claim 1 or 2, wherein the biasing force is larger than the biasing force of the biasing member.