JPS6060045B2 - lens barrel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to lens competition, and is particularly applicable to normal photography, for example, snapshot photography and landscape photography in which the camera and lens are held approximately horizontally with respect to the ground plane, and in landscape photography in which the camera and lens are held at an angle. The present invention relates to a lens competition suitable for close-up photography, extremely close-up photography, or copy photography held in an almost perpendicular position with respect to the plane of the earth.

As described above, the functions of the lens competition, which normally takes pictures in a horizontal position, and the lens competition, which takes pictures in an inclined or vertical position, often differ depending on the usage conditions. In other words, in order to make the lens competition, which is normally used in a horizontal position, easier to operate, for example, the mechanism for feeding out the adjustment rinse for focus adjustment is adjusted so that it can move easily, and a mechanism that allows it to move easily is also used. It is generally used to adopt

On the other hand, when the camera and lens are used in an inclined or vertical position, such as when taking close-up shots, the weight of the camera and lens acts on the lens feeding mechanism of the lens competition, and the optical system lens may move. Therefore, various attempts have been made to make the operating parts (screws, helioids, sliding parts, etc.) of the lens feeding mechanism heavier so that the optical system lens does not move. The following methods are known as such. i Increase the lead angle of the threaded part of the feeding mechanism.

ii Change the shape of the lead screw of the feeding mechanism.

Inject oil, etc. into the ili operating part to increase the load. iv Adjust the straight forward key. Measures such as these were adopted.

However, increasing the lead angle in i) may not be possible due to the relationship between the operating rotation angle of the contact part and the amount of extension of the optical system lens, or if the diameter of the lead screw becomes larger even with the same lead. The angle with respect to the optical axis becomes large, making it difficult to rotate.

Regarding selection of the chevron shape of the lead screw (ii), there is a problem in that selecting a screw having a preferable shape increases processing costs.

The method using oil or the like (iii) has a problem in that the oil softens or hardens depending on the temperature of the environment in which it is used.

Adjustment of the straight key (iv) is a method of improving operation by adjusting the friction between the straight key groove and the key, but the adjustment method involves difficult problems.

Furthermore, interchangeable lenses used for ordinary snapshot photography, landscape photography, etc. are often used for close-up photography and copy photography, and it has been difficult to adjust the mechanism for extending the optical system lens of a lens barrel suitable for such photography lenses.

In other words, when used in a horizontal position, it is desirable that the mechanism for extending the optical system lens of the lens barrel be light and able to operate smoothly; It is desirable to be able to adjust it by requiring some force during operation. This is because, in the case of close-up lenses, etc., the depth of focus is very small, so it is often preferable for lenses to be a little heavier. Therefore, it is extremely difficult to provide the market with a single lens barrel that is highly operable in both horizontal, tilted, and vertical positions, as there are problems that conflict with each other. It was hot. In view of the above circumstances, it is an object of the present invention to provide a lens barrel that allows the operation of the lens extension mechanism to be carried out smoothly and without any discomfort whether in a horizontal position or in an inclined or vertical position. .

The present invention is provided with a switching means that performs a switching operation according to changes between a normal photographing state (horizontal position) and a close-up/copy photographing state (tilted/vertical position), and a lens barrel It is an object of the present invention to provide a lens barrel that can perform operations appropriate to the posture of the camera and lens at the time by applying a load to or removing the load from an operating part of an optical system lens extension mechanism. .

Further, the present invention provides a lens barrel that allows the user to select whether to increase or decrease the operating resistance when operating the operating member, and to use the lens barrel according to the user's preference. The purpose is to

Another object of the present invention is to provide a lens barrel which is provided with a display that allows the user to visually confirm the operating resistance (heavy/light) selected by the user, and which can be conveniently used by the user. Next, embodiments of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a distance adjusting operation ring for adjusting the distance, and is mounted on the outer diameter portion of the distance scale ring 2. The distance scale ring 2 has click grooves 2a and 2b on its fitting surface with the operation ring 1, and is operated by a click spring 3 or the like tensioned in the groove 1a provided on the inner diameter of the operation ring 1. Performs a click action, operating ring 1 and distance scale ring 2
It is configured to maintain a relative positional relationship with the

Moreover, the operating ring 1 is located in the optical axis direction 0-' with respect to the distance scale ring 2.
When the distance ring 1 is moved to the left in the drawing, the click spring 3 is fitted into the click groove 2b, and the operating ring 1 is locked at the second position with respect to the distance scale ring 2.

A helicoid body 4 is fixed to the distance scale ring 2 by fixing means such as screws 5, and has an inner body part 4a and an outer body part 4b, and each body part has a helicoid part 4a1.
, 4b1.

The inner barrel portion 4a is helicoidally coupled to a helicoid portion 7a of a lens holding member 7 that holds the optical system 6, and the outer barrel portion 4b is helicoidally coupled to a helicoidal portion 8a of a fixed barrel 8 of the lens barrel. The fixed barrel 8 has a straight groove 8 along the optical axis 0-0''.
A key 9 fixed with a screw or the like is fitted into one end of the lens holding member 7.

10 is a connecting member, which connects the outer body 4 of the helicoid body.
A guide pin 11 is installed at one end of the ring, and a part of the guide pin is attached to the distance scale ring 2 so that the optical axis is 0-0''.
It fits into the straight guide groove 2c provided along.

A spring member 12 is fixed to the other end of the connecting member 10.

In the case of FIG. 1 in which the distance adjustment operation ring 1 is in the first click position (the position of the click groove 2a), the spring member 1
The second spring piece 12a rides on a protrusion 4b'' formed on the outer diameter of one end of the outer body 4b of the helicoid body 4, and the spring action is not activated.Next, how to use this embodiment and Let's talk about the action.

First, a case will be described in which the camera and lens are used in a horizontal position.

In this case, each operation part of the lens barrel, especially the operation ring 1
It is desirable that it can be operated smoothly. Operation ring 1
When placed in the first click position and the click spring 3 is fitted into the first click groove 2a, the operating ring 1 and the distance scale ring 2
are maintained in the first positional relationship shown in FIG.

In this state, the spring piece 1 of the spring member 12 of the connection ring is
2a rides on the protrusion 4b'' of the outer body 4b of the helicoid body, so the spring action does not work. Therefore, when the operation ring 1 is rotated, the operation ring 1, the distance scale ring 2, and the helicoid body 4 are rotated. rotate integrally, and the lens holding member 7 is rotated along the optical axis 0-' due to the helicoid action of the lens holding member 7 and the fixed body 8 of the inner body part 4a and the outer body part 4b of the helicoid body, respectively. It moves straight ahead, and focusing is performed by the movement of the optical system lens 6 back and forth.In this state of the operation ring 1 in this first positional relationship, the operation ring 1 is moved straight ahead and the distance scale ring 2 is connected to the distance scale ring 2. The spring action of the spring member 12 as a loading means is
b", no load is applied between the helicoid body 4 and the fixed body 8, and the operation ring 1 can be rotated smoothly. That is, in the first positional relationship, the rotation of the operating ring 1 can be performed smoothly. 2
As shown in the figure, the spring piece 12a of the spring 12 is in a floating state between the helicoid body 4 and the fixed body 8, and the spring force of the spring 12 is disabled.

Next, when photographing with the camera or lens tilted or perpendicular to the ground surface for close-up photography or copy photography, move the operation ring 1 in the optical axis direction (to the left in the figure) relative to the distance scale ring 2. By fitting the click spring 3 into the second click groove 2b, the operating ring 1 and the distance scale ring 2 are maintained in the second positional relationship.

(See Figure 3) By this operation, the connecting member 10 also moves in the straight groove of the distance scale ring 2 as the operating ring 1 moves, and the spring piece 12a of the spring member 12 fixed to the other end
is sandwiched between the protrusion 4b'' of the helicoid body and the fixed body 8. (See Figure 4) In this state, the spring action of the spring member is activated. Therefore, the operating ring 1 is in the second positional relationship. When the operating ring 1 is rotated in the state where the helicoid body 4 and the fixed body 8 are placed, the rotational force due to the helicoid action between the helicoid body 4 and the fixed body 8 causes the spring force of the spring member 12 to act on the helicoid body and the fixed body, becoming a load and becoming heavy. .

Further, even if the lens is placed in an inclined or vertical position, the spring force of the spring member 12 will not act as a load and the outer body of the helicoid body will not move from the helicoid coupling position of the fixed body 8. Therefore, even if a photograph is taken with the camera lens in an inclined or vertical position, the optical system lens 6 moves under its own weight and the focus is maintained at the adjusted position.

5 to 8 show other embodiments of the present invention, in which the first and second positional relationships between the operating ring 1, the distance scale ring 2, and the distance ring 1 and the distance scale ring 2 are maintained. The configuration of the click means (click spring 3, click grooves 2a, 2b), helicoid body 4, lens holding member 6, fixed body 8, etc. is as follows.
This embodiment is similar to the embodiments shown in FIGS.

20 is the spring member 12 fixed to one end of the connecting member 10;
It is an elastic member instead of.

A recess 4b'' is formed in the outer body 4b of the helicoid body in place of the protrusion 4b'', and as shown in FIG. The elastic member 20 is configured to fit into the case where the elastic member 20 is in the position shown in FIG. (Situation shown in Fig. 5) In the embodiment shown in Figs. 5 to 8, the click spring 3 of the operating ring 1 is inserted into the first click groove 2a of the distance scale ring 2, and the operating ring 1 and the distance scale are connected to each other. When the ring 2 is maintained in the first positional relationship, the elastic member 20 fixed to one end of the connecting member 10 fits into the recess provided in the outer body 4b of the helicoid body 4, and the outer body 4b and the fixed body 8 are in the first position. As shown in FIG. 6, the elastic member 20 is maintained in a state in which it does not act on any of the elements, and the helicoid body 4, which is interlocked with the rotation operation of the distance ring 1, can smoothly rotate with the fixed body 8. When the operating ring 1 is moved to the left in the figure and fitted into the second click groove 2b of the click spring 3 and maintained in the second positional relationship, the connecting member 10 also moves as the operating ring 1 moves.
As a result, the elastic member 20 comes out of the recess 4b'',
It invades between the outer body part 4b of the helicoid body and the fixed body 8,
As shown in FIG. 7, a load is applied between the outer body 4b and the fixed shell 8, and by rotating the operating ring, the outer body 4b of the helicoid body and the fixed shell 8 are Friction is generated to make the rotating operation of the operating ring 1 heavier. (See Fig. 8) As a result, when the operating ring 1 is kept in the first positional relationship, the rotating operation of the operating ring 1 can be performed smoothly, and the second
In order to maintain the positional relationship between the helicoid body and the fixed body, a moving load is generated on the helicoid connection between the helicoid body and the fixed body, so that the focus position will not change due to the weight of friction even if the lens/camera is tilted or vertically positioned. can.

As described above, the present invention provides a lens barrel in which the optical system 6 is moved forward and backward by operating the operating ring 1 to adjust the focus, and the optical system is moved by moving the operating ring 1 in the optical axis direction. This lens barrel is designed to change the moving load of the actuating part (helicoid coupling part) that contributes to.

As a result, when the lens is used in a horizontal position or in an inclined/vertical position, it is possible to apply a load to the moving member of the optical system suitable for each position, and a lens barrel with excellent operability can be obtained.

Furthermore, the present invention provides an optical system 6 by operating the operating ring 1.
The members 1, 2, and 4 that contribute to the movement of the optical system are provided with loading means 3 and 20, and the optical system is moved by means 4b'' and 4b'' that enable or disable the loading means depending on the usage state of the lens. This lens barrel is designed to change the moving load of the operating section that contributes to the

In the embodiments shown in FIGS. 1 and 3, the distance scale ring 2 has
By providing display portions 2d corresponding to the first and second positional relationships of the operating ring 1, it is possible to provide a lens barrel that allows the user to visually check whether the load means of the lens barrel is enabled or disabled. . Furthermore, the present invention allows the user to select heavy or light load resistance during operation depending on the selected position of the operating ring 1 in the same shooting state (horizontal shooting state or tilted/vertical shooting state). You can obtain operability according to your preference.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, in which the operating ring 1 is in a first positional relationship.

Claims (1)

[Claims] 1. An operating ring that rotates the fixed barrel around the optical axis and moves in a direction parallel to the optical axis, a helicoid barrel that is threadedly engaged with a lens holding member that holds a lens, and an operating ring disposed between the fixed barrel and the helicoid barrel. a connecting member that moves together when the operating ring moves in a direction parallel to the optical axis and does not rotate when the operating ring rotates about the optical axis; A lens barrel characterized in that a member is provided that applies a load to the rotation of the helicoid barrel by moving in a direction parallel to the optical axis.