JPH04348331A - Barrier opening and closing mechanism for camera - Google Patents

Abstract

PURPOSE:To a barrier opening and closing mechanism where the movement of a barrier blade becomes smoother. CONSTITUTION:As to the barrier opening and closing mechanism provided with two pairs of barrier blades which are paired, one pair of barrier blades is constituted as the sliding barrier blades 41 and 42 which interlock with a rotating ring, and the other pair of barrier blades is constituted as turning barrier blades 51 and 52 which interlock with the barriers 41 and 42, then the respective barrier blades are energized in a closing direction. Thus, the movement of this barrier blade becomes smoother than a sliding barrier blade.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrier opening/closing mechanism for opening and closing an opening at the front of a lens barrel in a compact camera.

0002

2. Description of the Related Art Some compact cameras have a built-in barrier opening/closing mechanism for opening and closing a photographing aperture. An example of the barrier opening/closing mechanism is disclosed in Japanese Patent Application Laid-Open No. 2-259737.
It is disclosed in the publication No.

In the invention described in JP-A-2-259737, the barrier is opened and closed by sliding four barrier blades. In other words, in the barrier opening/closing mechanism of the present invention, the two central barrier blades and the two outer barrier blades are engaged by the protrusion and the elongated hole, and are driven by the movement of the two central barrier blades. The outer two barrier blades are moved linearly in the same direction as the two central barrier blades.

0004

According to the barrier opening/closing mechanism of the invention, as described above, the two outer barrier blades are opened and closed by following the movement of the two central barrier blades. However, the two outer barrier blades are not biased independently of the two central barrier blades, so when closing the barrier, the barrier blades' own weight and friction between the barrier blades cause the barrier blades to close. , the movement of the barrier blades would become disorganized, leading to the photographer feeling uncomfortable or risking misinterpreting it as a malfunction.

Further, according to the barrier opening/closing mechanism of the invention, the barrier is opened and closed by sliding of two sets of barrier blades. However, in order to make the barrier blades slide, a guide rail or the like is required to guide the barrier blades, and friction between the guide rails and the barrier blades will affect the movement of the barrier blades. If the direction of the force applied to the barrier blade deviates even slightly, the friction between the barrier blade and the guide rail will increase, making it more likely that the barrier blade will malfunction. And malfunction of one barrier blade causes malfunction of other barrier blades.

The present invention has been made in view of these problems, and an object of the present invention is to provide a barrier opening/closing mechanism that allows smooth movement of barrier blades.

[0007]

[Means for Solving the Problems] Representative inventions disclosed in this application will be summarized as follows.

The barrier opening/closing mechanism of the present invention is a barrier opening/closing mechanism having two pairs of barrier blades, in which one pair of barrier blades is constructed as a sliding barrier blade interlocked with a rotating ring, and the other pair of barrier blades is configured as a sliding barrier blade that is linked to a rotating ring. The barrier blades are configured as rotating barrier blades that interlock with the sliding barrier, and each of the barrier blades is configured to be biased toward the closing direction. Rotating barrier blades do not require any structure to restrict movement (such as guide rails), making them less susceptible to friction, etc. However, if both sets of rotating barrier blades are used, the lens mirror This poses a problem when reducing the diameter of the tube (the storage area for the barrier blades tends to become large). Taking these points into consideration, the present invention has the above-mentioned configuration.

[0009]

[Operation] According to the above-mentioned means, a pair of barrier blades are configured as sliding barrier blades that are interlocked with the rotating ring, and the other pair of barrier blades are configured as rotating barrier blades that are interlocked with the sliding barrier. Compared to the case where both are sliding barrier blades, the influence of friction with the movement regulating member can be reduced, and the barrier blades can move smoothly.

Furthermore, since each of the barrier blades is biased toward the closing direction, the barrier blades are less affected by their own weight and the frictional force between the barrier blades, resulting in smoother movement.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the front part of a fixed lens barrel 1 of a compact camera to which a barrier opening/closing mechanism according to the present invention is applied. A rotating ring 2 is installed. In the barrier opening/closing mechanism of this compact camera, the rotating levers 31 and 32 are actuated by the rotation of the rotating ring 2, thereby sliding the sliding barrier blades 41 and 42, and furthermore, the sliding barrier blades 41 and 42 are slid. Feather 4
1 and 42, the rotating barrier blades 51 and 52 are rotated to open and close the barrier. The details of the barrier opening/closing mechanism of this embodiment will be explained below.

As shown in FIG. 3 (a diagram showing the state when the barrier is opened), a ring spring 3 is hung between the fixed lens barrel 1 and the rotating ring 2 of the embodiment. The rotating ring 2 is biased in the barrier opening direction. Note that FIG. 3 is a view taken along line BB in FIG. 1, and in FIG. 3, the outer diameter line of the member is shown by a solid line regardless of the front or rear of the member.

The rotary levers 31 and 32, which are rotated by the rotation of the rotary ring 2, are attached to a shaft 31a as shown in FIG.
, 32a, the base end thereof is pivotally supported by the fixed lens barrel 1 so as to be rotatable about the lens barrel 1. , 32a. In addition, this rotating lever 31
, 32 are hung with lever springs 31b, 32b, one end of which is hung on the rotating ring 2. and,
The vertical portions 31d and 32d of the rotating levers 31 and 32 are
The lever springs 31b and 32b bias the rotary ring 2 in the direction of contact. As a result, as the rotary ring 2 rotates clockwise in FIG. 3, the rotary levers 31 and 32 rotate around the shafts 31a and 32a in the barrier closing direction (see FIG. 7). This results in the state shown in the diagram (diagram showing the state at the time). In addition, in FIG. 7, the outer diameter line of the member is shown by a solid line regardless of the front or rear of the member.

Further, the free end sides of the rotary levers 31 and 32 have long lengths as shown in FIGS. 3 and 4 (conceptual diagrams showing the mutual relationship between the rotary lever and the sliding barrier blade when the barrier is opened). Holes 31c and 32c are provided respectively, and sliding barrier blades 41 and 42 (Fig. 4
and FIG. 5) are engaged with the protrusions 41a and 42a attached thereto. Therefore, the rotation levers 31 and 32 are
When the sliding barrier blades 41, 42 rotate in the barrier closing direction about 1a, 32a, the guides 71a, 71b,
It moves inward along 72a and 72b to reach the state shown in FIG. 8 (a conceptual diagram showing the mutual relationship between the rotating lever and the sliding barrier vane when the barrier is closed). In addition, Figure 4
In FIG. 8, the outer diameter line of the member is shown by a solid line regardless of the front or rear of the member.

On the other hand, the rotating barrier blades 51 and 52 are shown in FIG.
As shown in (conceptual diagram showing the mutual relationship between the sliding barrier blade and the rotating barrier blade when the barrier is opened), the shaft 51a
, 52a, the base end of which is rotatably supported by the fixed lens barrel 1. On the other hand, this rotating barrier blade 51
, 52 are provided with protrusions 51b, 52b in the middle, and these protrusions 51b, 52b push the sliding barrier blades 41, 4 when the barrier is opened by the urging force of the blade springs 61, 62.
It is made to abut on the outside of 2. Therefore, when the sliding barrier blades 41 and 42 move in the barrier closing direction, that is, inward, the rotating barrier blades 51 and 52 rotate inward due to the biasing force of the blade springs 61 and 62. The state shown in FIG. 9 (conceptual diagram showing the mutual relationship between the sliding barrier blade and the rotating barrier blade when the barrier is closed) is reached. In FIG. 5, reference numerals 81 and 82 indicate notches 51c formed on the free end sides of the rotating barrier blades 51 and 52.
, 52c to restrict the rotation width of the rotation barrier blades 51, 52. In addition, in FIGS. 5 and 9, the outer diameter line of the member is shown by a solid line regardless of the front or rear of the member.

Note that FIG. 2 is a view taken along line A-A in FIG. 1, and this FIG.
1, 32, the interrelationship of sliding barrier vanes 41, 42 and rotating barrier vanes 51, 52 is shown. Also, Figure 6
Rotating levers 31, 32, sliding barrier blades 41, 42, and rotating barrier blades 51, 52 when closing the barrier.
The interrelationships between the two are shown. In both figures, the outer diameter line of the member is shown by a solid line regardless of the front or rear of the member.

FIG. 10 is a view taken along the line C--C in FIG.
FIG. 11 is a view taken along line DD in FIG. 6.

According to the above embodiment, the pair of barrier blades are configured as sliding barrier blades 41 and 42, and the other pair of barrier blades are rotary barrier blades 51 and 51, which are interlocked with the sliding barriers 41 and 42, respectively. 52, the movement is smoother than when both are sliding barrier blades.

[0020] Also, barrier blades 41, 42, 51, 52
Since each of the barrier blades is biased in the closing direction, it is less affected by the weight of the barrier blades and the frictional force between the barrier blades, and the movement becomes smoother.

[0021] The invention made by the present inventor has been specifically explained based on the examples above, but the present invention is not limited to the above-mentioned examples, and can be modified in various ways without departing from the gist thereof. Needless to say.

[0022]

[Effects of the Invention] According to the barrier opening/closing mechanism according to the present invention,
In a barrier opening/closing mechanism having two pairs of barrier blades, one of the pair of barrier blades is configured as a sliding barrier blade linked to a rotating ring, and the other pair of barrier blades is configured as a sliding barrier blade linked to the sliding barrier. Since the barrier blades are constructed as movable barrier blades and each of the barrier blades is biased toward the closing direction, the barrier blades can move smoothly.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the front part of a fixed lens barrel of a compact camera to which a barrier opening/closing mechanism is applied.

FIG. 2 is a diagram showing the mutual relationship between a rotating lever, a sliding barrier blade, and a rotating barrier blade when the barrier is opened.

FIG. 3 is a diagram showing the mutual relationship between the rotating ring and the rotating lever when the barrier is opened along line BB in FIG. 1;

FIG. 4 is a conceptual diagram showing the relationship between the rotating lever and the sliding barrier blade when the barrier is opened.

FIG. 5 is a conceptual diagram showing the mutual relationship between the sliding barrier blade and the rotating barrier blade when the barrier is opened.

FIG. 6 is a diagram showing the mutual relationship between the rotating lever, the sliding barrier blade, and the rotating barrier blade when the barrier is closed.

FIG. 7 is a diagram showing the mutual relationship between the rotating ring and the rotating lever when the barrier is closed.

FIG. 8 is a conceptual diagram showing the relationship between the rotating lever and the sliding barrier blade when the barrier is closed.

FIG. 9 is a conceptual diagram showing the mutual relationship between the sliding barrier blade and the rotating barrier blade when the barrier is closed.

FIG. 10 is a view taken along line CC in FIG. 6;

FIG. 11 is a diagram taken along line DD in FIG. 6;

[Explanation of symbols]

1 Fixed lens barrel 2 Rotating ring 31, 32 Rotating lever 41, 42 Sliding barrier blade 51, 52 Rotating barrier blade

Claims (1)

[Claims] Claim 1: A barrier opening/closing mechanism having two pairs of barrier blades, in which one pair of barrier blades is configured as a sliding barrier blade that is interlocked with a rotating ring, and the other pair of barrier blades are configured as sliding barrier blades that are interlocked with a rotating ring. 1. A barrier opening/closing mechanism for a camera, characterized in that the barrier blade is configured as a rotating barrier blade linked to a barrier, and each of the barrier blades is biased in a closing direction.