JPH043285Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photographic magnification presetting device suitable for photographing where photographic magnification is important in a lens capable of close-up photography.

When taking photographs where accurate magnification on the film surface is important, such as academic or medical photography, conventionally, the magnification scale attached to the distance adjustment ring was
The photographic magnification is simply set according to the index of the fixed lens barrel. For this reason, individual differences are unavoidable, and even when the same person repeatedly sets the same magnification, they cannot strictly set the same magnification, and are forced to take images at inaccurate magnifications. .

Furthermore, if you accidentally rotate the distance adjustment ring after setting the magnification, you will have to take your eyes off the viewfinder and readjust the magnification scale and index.

In order to solve this problem, a conventional lens has been proposed in which a click stop mechanism is provided between the distance adjustment ring and the fixed lens barrel to stop the distance adjustment ring at multiple frequently used photographic magnifications. ing. According to this device, it is possible to reliably obtain a fixed magnification for close-up photography, but since the click stop position is fixed, it is possible to obtain a photographing magnification that is slightly different from the photographing magnification at which the click is provided. When taking a photograph or adjusting the focus using the distance adjustment ring, there was a drawback that the lens would fall into a nearby click, making it impossible to take a photograph at the desired magnification or to be unable to focus. Also, if there are many clicks, once you change the shooting magnification,
In order to return to the original magnification, you must take your eyes off the viewfinder and readjust the magnification.

For super-telephoto lenses, a click stop mechanism is known that stops the distance adjustment ring at a desired shooting distance, but this mechanism is attached to a fixed lens barrel that is rotatable and can be moved to any position using a fixing screw. A locking position setting ring is provided so that the lens can be fixed, and a single click stop mechanism is provided between the locking position setting ring and the distance adjustment ring, and is applicable to close-up lenses that set multiple different photographic magnifications. It is not possible.

The present invention was inspired by the preset mechanism of the distance adjustment ring of a super-telephoto lens, and was developed with the aim of creating a device that can arbitrarily preset multiple photographing magnifications for a close-up lens. A magnification scale ring is rotatably fitted and fixed at any position by a fixing means, and a plurality of click stop mechanisms corresponding to a plurality of imaging magnifications are provided between the magnification scale ring and the fixed lens barrel. established,
Furthermore, the present invention is characterized in that a click stop mechanism is provided between the distance adjustment ring and the magnification scale ring to click the distance adjustment ring at a position where a photograph is to be taken at the photographing magnification indicated by the magnification scale ring.

The present invention will be described below with reference to the illustrated embodiments.
First, the presetting mechanism of the distance adjustment ring of the super-telephoto lens will be explained with reference to FIG. In the same figure, 1
1 is the fixed lens barrel of the lens, 12 is this fixed lens barrel 11
By rotating the distance adjusting ring, the focusing lens is moved by a well-known interlocking mechanism.

A locking position setting ring 14 is rotatably fitted to the fixed lens barrel 11 adjacent to the distance adjusting ring 12 .
A radial fixing screw 15 for preventing relative rotation with respect to 1 is screwed together. A click ball 18 is supported in a radial hole 16 formed in the locking position setting ring 14 and is urged by a leaf spring 17 toward the surface facing the distance adjustment ring 12. A click groove 19 for receiving the click ball 18 is formed at the top.

Therefore, in this click stop mechanism, the locking position setting ring 14 is rotated relative to the distance adjustment ring 12 by loosening the fixing screw 15, and the click ball 18 is rotated relative to the distance adjusting ring 12.
When the click groove 19 is engaged with the locking position setting ring 14, the locking position setting ring 14 rotates together with the distance adjustment ring 12. In this state, rotate the distance adjustment ring 12 to adjust the focus to the desired shooting distance, and then use the fixing screw 1
5 fixes the locking position setting ring 14 to the fixed lens barrel 11, the shooting distance is set to the click ball 18.
Preset by . That is, the distance adjusting ring 12 is rotated relative to the fixed locking position setting ring 14, and the click groove 19 is aligned with the click ball 1.
Even if the distance adjustment ring 12 is detached from the lens 8 and photographed at a different photographing distance, if the distance adjustment ring 12 is rotated to the position where the click groove 19 fits into the click ball 18 again,
The focusing lens can be instantly moved to a preset shooting distance.

The photographing magnification presetting device for a close-up lens of the present invention was completed based on this presetting mechanism for a super-telephoto lens, and an embodiment thereof is shown in FIGS. 2 and 3. The fixed lens barrel 11 and the distance adjustment ring 12 are the same elements as the lens barrel shown in FIG. The indicator ring 22 is provided with a fixed indicator 23 (see FIG. 3). A magnification scale ring 24 is rotatably fitted on the outer periphery of the fixed inner cylinder 21.
A radial fixing screw 20 for fixing is screwed into the radial direction. And this magnification scale ring 24 has a third
As shown in the figure, two stages of magnification scales 30, 31, a movement index 32, a depth index 33, and a depth scale 34 are provided. A magnification scale 30 is a magnification scale when the present close-up lens alone is used for close-up photography, and a magnification scale 31 is a magnification scale when a close-up ring or a close-up lens is used in combination.

The distance adjustment ring 12 is linked with the focusing lens as described above, and a click stop mechanism 25 is provided between the distance adjustment ring 12 and the magnification scale ring 24. This click stop mechanism 25 is constructed by fitting a click ball 27 into a radial hole 26 formed in a magnification scale ring 24, and urging the click ball 27 toward the surface facing the distance adjustment ring 12 by a leaf spring 28. A click groove 29 into which the click ball 27 fits is formed in the distance adjustment ring 12. The above magnification scale 3 of the magnification scale ring 24
0 and 31 move the click ball 27 into the click groove 2.
9 and rotated together with the distance adjustment ring 12, the fixed index 23 is attached so as to face the correct photographing magnification scale corresponding to the rotational position of the distance adjustment ring 12 at that time. There is.

A plurality of click stop mechanisms 35 are provided between the magnification scale ring 24 and the fixed inner cylinder 21, each corresponding to a specific magnification of the magnification scales 30, 31 or a moving indicator 32. This click stop mechanism 35 accommodates a compression spring 37 and a click ball 38 urged outward by the compression spring 37 in a bottomed radial hole 36 bored in the fixed inner cylinder 21, and a magnification scale ring. A click groove 39 into which a click ball 38 can be inserted is formed on the inner surface of 24 at a scale portion of a plurality of predetermined imaging magnifications (in the illustrated example, 1/2x, 1/10x, 1/4x, and the moving index 32). It is composed of Note that a shooting distance scale 40 is attached to the outer periphery of the distance adjustment ring 12 (the third
figure).

According to this apparatus having the above-mentioned configuration, it is possible to take pictures with the photographing magnification preset as follows. If you want to take pictures at 1/4x, the magnification scale ring 24 should be moved to the fixed inner cylinder 21 regardless of whether the click ball 27 of the click stop mechanism 25 and the click groove 29 are engaged or not. to align the 1/4x scale of the magnification scale 30 with the fixed index 23. At this time, the click ball 38 of the click stop mechanism 35 enters the click groove 39 on the lower surface of the 1/4x scale, and the magnification scale ring 24 is locked, so in this state, the fixing screw 20
is tightened to fix the magnification scale ring 24 to the fixed inner cylinder 21. After that, when the distance adjustment ring 12 is rotated and the click ball 27 is fitted into the click groove 29, the focusing lens is correctly positioned at the photographic magnification position of 1/4x. Therefore, even after setting the magnification scale ring 24 as described above and then rotating the distance adjustment ring 12 to take a picture at a different magnification, you can instantly reach the set magnification without taking your eyes off the viewfinder. The distance adjustment ring 12 can be returned. Furthermore, as far as the fixed position of the magnification scale ring 24 is concerned with the photographic magnification at which the click groove 39 is provided, there is no risk of individual differences in index alignment.

Of course, it is also possible to fix and preset the magnification scale ring 24 to a photographing magnification for which the click groove 39 is not provided. Since the magnification scale ring 24 can be fixed at any position using the fixing screw 20, there is no risk of the click ball 38 getting into the click groove 39 near the imaging magnification to be set.

Furthermore, by aligning the movable index 32 of the magnification scale ring 24 with the fixed index 23, regulating the position by the click stop mechanism 35, and tightening the fixing screw 20, the distance between the movable index 32 and the fixed index 23 can be adjusted just like a normal lens. Align scale 40, depth index 33, depth scale 3
4 can be used in a general way. In this case, if the positions of the click ball 27 and the click groove 29 of the click stop mechanism 25 are appropriately selected, the click stop mechanism 25 can be prevented from working within the rotation range of the distance adjustment ring 12. The annoyance caused by click stops can be eliminated.

Further, as for the locking force between the click stop mechanism 25 and the click stop mechanism 35, it is desirable that the click stop mechanism 25 has a stronger locking force. If the locking force is set in this way, the click stop mechanism 25
When the click ball 27 and the click groove 29 are engaged and the fixing screw 20 is loosened, the distance adjustment ring 12 and the magnification scale ring 24 can always be rotated together. The distance adjustment ring 12 can be click-stopped at the photographing magnification.

By attaching the magnification scale 31, it is possible to preset the photographing magnification in the same way as when using a single lens even when using a close-up ring or close-up lens. If this magnification scale 31 and the magnification scale 30 are color-coded, for example, they will be easier to see and more practical.

As described above, according to the present invention, when the magnification scale ring is click-stopped at multiple photographing magnifications, the preset constant photographing magnification is always maintained, regardless of individual differences among photographers, the passage of time, etc. Even if the distance adjustment ring is rotated during photographing, the original photographing magnification can be quickly returned to without taking one's eyes off the viewfinder. In other words, if the distance adjustment ring is clicked to the position defined by one of the click stop mechanisms between the magnification scale ring and the fixed lens barrel, the photographic magnification will be set to one of the multiple clicks between the magnification scale ring and the fixed lens barrel. You can return to the corresponding original magnification. In addition, for shooting magnifications that are not click-stopped, if you use a fixing means to fix the magnification scale ring at the photographer's desired shooting magnification or shooting distance, you can repeat it as many times as you like after shooting subjects at other magnifications or distances. Can be set to the same magnification. That is, similarly, if the distance adjustment ring is clicked to a position between the magnification scale ring and the magnification scale ring by one click stop mechanism, it returns to the original photographic magnification corresponding to the magnification scale ring fixed by the fixing means. be able to. Therefore, it is very convenient for use in taking academic photographs, dental photographs, and other medical photographs that require strict matching of photographic magnifications.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main parts showing an example of a conventional distance adjustment ring click stop mechanism used in a super-telephoto lens, and Fig. 2 shows an embodiment of the magnification presetting device for a close-up lens according to the present invention. FIG. 3 is a sectional view of the main part shown, and FIG. 3 is a developed plan view of the main part. 11...Fixed lens barrel, 12...Distance adjustment ring, 21
... fixed inner cylinder, 22 ... index ring, 23 ... fixed index, 24 ... magnification scale ring, 25, 35 ... click stop mechanism, 27, 38 ... click ball, 29, 39 ... click groove , 30, 31...
Magnification scale.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A distance adjustment ring and a magnification scale ring are each rotatably fitted into a fixed barrel of a lens, and between the magnification scale ring and the fixed barrel, a plurality of photographic magnifications can be set. A plurality of click stop mechanisms corresponding to the distance adjustment ring and the magnification scale ring are provided, and one click stop mechanism is provided between the distance adjustment ring and the magnification scale ring for clicking the distance adjustment ring to a position for photographing at the photographing magnification indicated by the magnification scale ring. A photography magnification presetting device for a close-up lens, comprising a mechanism and a fixing means for fixing the magnification scale ring to a fixed lens barrel at an arbitrary position. (2) In claim 1 of the utility model registration claim, the locking force of the click stop mechanism between the distance adjustment ring and the magnification scale ring is the locking force of the click stop mechanism between the magnification scale ring and the fixed lens barrel. A magnification preset device for close-up lenses that is set more strongly.