JPH0443853Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an auxiliary lens device that is attached to a compact camera with a built-in zoom lens to control the photographing range to a closer range.

Conventional Technology In recent years, various lens shutter cameras, so-called compact cameras with a built-in zoom lens, have been put into practical use, and are equipped with a zoom lens with a zoom ratio of approximately 2x. In addition to the range of 1m to ∞, it is generally equipped with a macro photography function that allows you to photograph subjects within a range of approximately 30cm to 1m.

Now, looking at the above macro photography function in more detail, you can usually take pictures of subjects within the above range by moving the appropriate lens within the built-in zoom lens with the built-in zoom lens set to its longest focal length. It has been made possible to do so. Also, at this time, it goes without saying that the viewfinder field frame is controlled for parallax correction as the photographing distance approaches.

Problems to be Solved by the Invention As described above, conventional compact cameras with built-in zoom lenses generally have a macro photography function.

However, when considering the frequency of shooting using the macro shooting function, it goes without saying that the frequency of shooting using the macro shooting function is usually less than that of normal shooting, and for photographers who do not use the macro shooting function very often. However, the above-mentioned lens movement configuration for the macro photography function only unnecessarily increases the cost of the entire camera.

In addition, with conventional cameras, the macro photography function can be used at the maximum focal length setting, so
The depth of field during macro photography becomes shallow, and considerations must be made to achieve more accurate ranging, for example, and in addition, it is necessary to adjust the size of the subject, that is, the shooting magnification to the desired magnification. To set this, the camera itself must be moved to vary the distance to the subject, which is troublesome.

Furthermore, when using a conventional camera's built-in strobe device for macro photography, the flash operation is performed with a wider irradiation angle of view as necessary, so in some cases, the There is a risk that glare or overexposure may occur due to reflection.

The present invention was developed in consideration of the above-mentioned points, and by being attached to a compact camera with a built-in zoom lens, the shooting range of the camera is controlled to a closer range within the entire zooming range of the built-in zoom lens. That is, an object of the present invention is to provide an auxiliary lens device that can be controlled to perform macro photography.

Means for Solving the Problems The auxiliary lens device according to the present invention is mounted in front of the zoom lens in a compact camera with a built-in zoom lens so that it can move in conjunction with the movement of the zoom lens due to the zooming operation, and When combined, an auxiliary lens that controls the distance range that can be photographed to an extremely close range, and a lens barrel that holds a first polarizing member that polarizes the light that passes through this auxiliary lens, and that can move in conjunction with this lens barrel. Connecting parts, camera viewfinder window, distance measurement window, photometry window,
A frame body consisting of a viewfinder section in which a field correction frame, a distance measurement correction prism, a light shielding member, and a second polarization member whose polarization direction of light is perpendicular to the first polarization member are positioned in front of the built-in strobe light emitting section. ,
The camera is provided with a mounting arm that allows the frame to be mounted on the camera and has one end that is connected to the frame and the other end that can be engaged with the viewfinder eyepiece of the camera.

Function Since the auxiliary lens device according to the present invention is configured as described above, the zoom lens can be zoomed with the lens barrel placed in front of the built-in zoom lens and the frame attached to the camera body using the mounting arm. If you do this, the lens barrel will also move accordingly. Therefore, by the action of the auxiliary lens held by the lens barrel, the shooting distance range can be varied from the camera's original range, for example, 1 m to ∞, to a closer range, for example, 40 to 90 cm, over the entire zooming range. will be done.

In addition, since the light-shielding member in the viewfinder part of the frame covers the metering window of the camera body, the camera is always controlled to use a strobe, and therefore the depth of field is deep due to the aperture narrowing effect. You will be able to take macro shots.

Furthermore, first and second beams whose polarization directions are orthogonal to each other
The polarizing members are arranged in front of the built-in zoom lens and in front of the light emitting part of the built-in strobe, respectively, so the polarizing members have the property of giving directionality to the transmitted light and also have a light attenuation effect due to this property. Based on the characteristics, the light passing through the built-in zoom lens and reaching the film surface is controlled, thereby preventing glare and overexposure of the subject.

Embodiment FIG. 1 is an external perspective view showing an embodiment of the auxiliary lens device according to the present invention together with a compact camera with a built-in zoom lens that does not have a macro photography function. FIG. 2 is a schematic cross-sectional view of this embodiment;
zoom lens 2 by an appropriate amount from the state shown in FIG.
A partial cross-section of this embodiment is shown corresponding to a state in which the lens barrel is moved forward, and FIG.

As is clear from FIGS. 1 and 2, in this embodiment, a compact camera 1 with a built-in zoom lens that is integrally equipped with a zoom lens 2 has a lens barrier storage port 2 in front of the zoom lens 2.
a, and has a distal end 6a that can be engaged with the
The lens barrel 3 is mounted by a mounting member 6 biased by an elastic member 7 in the direction of the arrow shown in , and moves in conjunction with the lens 2 .

Inside the lens barrel 3, an auxiliary lens 4 and a first polarizing member 5 are held, which are used in combination with the zoom lens 2 to control the photographable range to an extremely close range. Further, at the rear of the upper part of the lens barrel 3, there is provided a connecting structure including protruding walls 3a, 3b facing each other and a connecting pin 8 disposed between the protruding walls 3a, 3b. The lens barrel 3 is connected to a connecting portion 11 of a frame 10, which will be described later, so as to be able to move in conjunction with the lens 2 described above. Furthermore, a filter attachment screw 9 is formed at the tip of the lens barrel 3 so that a suitable optical filter can be attached thereto.

As is clear from the drawings, the frame 10 in this embodiment includes a connecting portion 11 having a sliding groove 13 in which the connecting pin 8 slides, a viewfinder window and a measuring instrument which are not shown in the figure of the main body of the camera 1. Located in front of the distance window, metering window, and light emitting part of the built-in strobe device, the lens barrel 3
a field of view correction frame 14 for correcting the field of view or distance measurement operation that is necessary due to the installation of the
The distance measurement correction prism 15, the light shielding member 16 for closing the photometry window and placing the camera in strobe photography mode, and the light emitted from the light emitting part of the built-in strobe in a polarization direction perpendicular to the polarization direction of the first polarization member 5. The viewfinder section 12 includes a second polarizing member 17 that polarizes light.

In addition, the upper part of the frame 10 is provided with a well-known hinge structure 1.
A mounting arm 18 is connected via 9.

It is clear from FIG. 2a that this mounting arm 18 is bent in accordance with the thickness of the camera 1 body and has a tip 18a that engages with the viewfinder eyepiece 1a of the camera 1. 10 is attached to the main body of the camera 1.

Since the present embodiment is configured as described above, when the frame body 10 is now placed on the camera 1 and the distal end portion 18a of the adhesive arm 18 is engaged with the viewfinder eyepiece portion 1a, first the above-mentioned The frame 10 will be attached to the camera 1 body. Next, the mounting member 6 of the lens barrel 3 is pressed inward according to the biasing force of the elastic member 7, and its tip 6a is positioned in the lens barrier storage opening 2a in front of the zoom lens 2. After this, When this pressure is released, the tip portion 6a engages with the lens barrier storage opening 2a, and the lens barrel 3 is then mounted in front of the zoom lens 2.

When the lens barrel 3 and frame 10 are attached to the zoom lens 2 and camera 1 as described above, the distance range that can be photographed is controlled to the extremely close range by the function of the auxiliary lens 4 inside the lens barrel 3. Become.

Control of the shooting range to the extremely close range is done using the lens barrel 3.
Since the movement of the zoom lens 2 moves in conjunction with the movable part of the zoom lens 2 due to the relationship between the connecting pin 8 and the sliding groove 13, it goes without saying that the movement of the zoom lens 2 is carried out over the entire movement range of the zoom lens 2. By moving the lens barrel 3 and zoom lens 2 through a zooming operation, macro photography can be performed at various focal lengths. Note that it is clear that the photographing magnification of the subject changes at this time.

On the other hand, since the photometric window of the camera 1 is blocked by the light shielding member 16 due to the device attached to the camera 1 of the frame 10, the camera 1 is forcibly controlled to be in a strobe photography state. Therefore, the built-in strobe emits light every time a macro photograph is taken, and the light is polarized via the polarizing member 17 and is therefore attenuated and supplied to the subject.

Now, if we look at the light from the subject, including the reflected light emitted from the built-in strobe mentioned above, it goes without saying that it enters the lens barrel 3 and first passes through the auxiliary lens 4 and the first polarizing member 5. The light is then polarized and attenuated, and then passes through the zoom lens 2 to reach the film surface, that is, to form an image.

At this time, since the polarization direction of the first polarizing member 5 is perpendicular to that of the second polarizing member 17 as described above, the built-in strobe light is included in the light incident on the lens barrel. The light is significantly attenuated based on the polarizing action of both polarizing members 5 and 17, and therefore the occurrence of glare and overexposure phenomena due to reflection is prevented.

FIG. 3 is an external perspective view showing the state of movement from the state shown in FIG. 1 of this embodiment.

As is clear from the figure, only the lens barrel 3 moves in conjunction with the forward movement of the zoom lens 2. That is, the lens barrel 3 is connected to the sliding groove 13 of the connecting pin 8.
The frame body 10 consisting of the connecting part 11 and the viewfinder part 12 remains mounted on the camera 1 in the same state as shown in FIG. 1, and the lens barrel 3 The field of vision is corrected as a result of the use of the camera.

Effects of the invention According to the auxiliary lens device of the invention, it is attached in front of the built-in zoom lens of a compact camera with a built-in zoom lens, moves in conjunction with the movement of the zoom lens due to zoom operation, and is combined with the zoom lens inside. an auxiliary lens that controls the shooting range to an extremely close range;
Equipped with a lens barrel that has a polarizing member of This has the effect that various imaging magnifications can be set by the zooming operation of the zoom lens without changing the distance between the camera and the subject.

Furthermore, when the auxiliary lens device according to the present invention is attached to a compact camera with a built-in zoom lens, it blocks the metering window of the camera and forcibly controls the camera to flash photography mode.
During macro photography, the built-in strobe device always emits light, which allows the aperture to be narrowed down, and this aperture effect allows for macro photography with a deep depth of field, which is advantageous in terms of distance measurement accuracy, etc. It has an effect.

Furthermore, since first and second polarizing members whose polarization directions are perpendicular to each other are positioned inside the lens barrel, that is, in the photographing optical path and in front of the light emitting part of the built-in strobe, the light emitted by the built-in strobe is polarized. As a result, it also has the effect of preventing the occurrence of glare and overexposure due to reflections on the subject surface.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing an embodiment of the auxiliary lens device according to the present invention together with a compact camera with a built-in zoom lens, Fig. 2 a and b are partial schematic cross-sectional views of the embodiment, and Fig. 3 is the embodiment of the present invention. FIG. 1...Compact camera with built-in zoom lens, 2
... Built-in zoom lens, 3 ... Lens barrel, 4 ... Auxiliary lens, 5 ... First polarizing member, 6 ... Mounting member, 7 ... Elastic member, 8 ... Connection pin, 9 ... Filter attachment Screw, 10...Frame body, 11...Connection part, 12...Finder part, 13...Sliding groove, 14...Visual field correction frame, 15...Distance measurement correction prism, 16...Shading member, 17 ... Second polarizing member, 18 ... Mounting arm, 19 ... Hinge configuration.

Claims (1)

[Scope of utility model registration request] In a compact camera with a built-in zoom lens, the camera is mounted in front of the zoom lens so as to be movable in conjunction with the movement of the zoom lens during zooming operations, and when combined with the zoom lens, controls the distance range that can be photographed to an extremely close range. a lens barrel holding an auxiliary lens that polarizes the light passing through the auxiliary lens; a connecting portion that is connected to the lens barrel so as to perform the interlocking movement; and a viewfinder window of the camera. , a distance measurement window, a photometry window, and a visual field correction frame, a distance measurement correction prism, a light shielding member, and a second polarization member whose light polarization direction is orthogonal to the first polarization member, respectively, in front of the distance measurement window, the photometry window, and the built-in strobe light emitting unit. A mounting arm for mounting the frame on the camera, the mounting arm having a frame including a viewfinder portion for positioning the camera, one end connected to the frame and the other end capable of engaging with the viewfinder eyepiece of the camera. An auxiliary lens device comprising: