JPS5962837A - Vibration proofing device for camera shutter - Google Patents

Abstract

PURPOSE:To prevent the camera blur by allowing a balance weight, which has an inertial mass larger than that of a light shielding body, to interlock with the light shielding body and supporting the balance weight shakably by a supporting shaft which is provided in parallel at the exposure edge of the light shielding body. CONSTITUTION:When a release button is depressed, restraint of a front blade driving lever 9 is released, and an auxiliary blade and a rectangular blade 3a are moved to siding positions under an aperture 2 to perform exposure. By clockwise turning of the front blade driving lever 9, a balance weight 22 is turned clockwise up to a position indicated by a broken line, and a gravity center G of the balance weight 22 is displaced to the left by a distance S. This displacement direction is opposite to the running direction of the rectangular blade 3a. Thus, reactions of the balance weight 22 and a front blade group 3 are cancelled. Since the balance weight 22 which is moved in the direction opposite to that of the light shielding body 3 or 4 while interlocking with this light shielding body can be made small-sized and its displacement quantity can be made very small, this balance weight can be provided in a narrow camera body space, and the camera blur is prevented sufficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shutter vibration isolating device, and more particularly to a camera shutter vibration isolating device that prevents the camera body from photographing due to a reaction when the shutter curtain or shutter blade moves.

Camera shake that occurs when the shutter opens and closes in a camera equipped with a shutter that moves in one direction, such as a focal plane shutter, or a light-shielding part (hereinafter simply referred to as a light-shielding body) such as a shutter blade or shutter blade. Conventionally, this was mainly due to the impact when the light shielding body in No. 7 stopped running. Therefore, various anti-vibration means are known to reduce the impact and prevent the light shield from bouncing at the same time as the camera lens 7'L.

On the other hand, in order to speed up the shutter beyond a certain level,
The traveling speed of the light shielding body itself must be greater than that of the conventional one, but in order to meet this demand, it is necessary to increase the acceleration of the traveling light shielding body. Therefore, as a reaction to the large acceleration, the force that the camera body receives increases in the direction opposite to the traveling direction of the light shield, and the resulting displacement of the camera body, that is, the camera body 7L, cannot be ignored. becomes. In particular, when a camera is mounted on a support such as a king's leg, the camera body is displaced due to the reaction during the travel of the flasher, and as soon as the travel ends, the elasticity of the camera support Temporary return to original position
It vibrates along with the camera support. Moreover, since the vibration lasts for a long time, the camera is
, it will have a negative impact on the photos taken. The first movement occurs both when opening and closing the Nyanota.
The continuation of the vibration after the device is closed does not affect the photos taken.

However, since the vibrations caused when the opening is opened have a negative effect on the photographs taken, at least some measures should be taken to prevent the vibrations caused by the reaction of the light shield when the opening is opened. It must be established.

The camera shake caused by the reaction to the light shield as described above moves in the opposite direction at the same speed as a counterweight full light transmitter whose inertial mass is approximately equal to that of the light shield, according to the law of motion. It is possible to prevent T3J by configuring them so that the forces caused by their reactions cancel each other out. However, it is difficult to secure a large enough space within a narrow camera to allow the countershaft to move approximately the same distance as the light shield.

In view of the above-mentioned concerns, the present invention aims to provide a defense pupil for a camera shutter having a counterweight means that can be installed within a narrow space of the camera without increasing the external dimensions of the camera. That purpose.

In order to achieve the above object, the present invention provides a camera shutter that opens and closes a glossy opening using a pair of light shielding bodies that run in one direction to produce foggy light, and in which at least one of the pair of light shielding bodies is used to block light. A counterbalance @i having an inertial mass larger than the body is interlocked, and a counterweight at the front i is swingably supported by a support shaft provided parallel to the exposure end H of the light shielding body. Simultaneously with the movement of the light shielding body, the above-mentioned counterweight is displaced in the direction VJ, opposite to the force direction of the exposed edge of the sharpener, and the displacement is the distance traveled by the exposed edge as indicated by Dfi. Okay, I'll be 90.)
41t, what was accomplished is ire'd.

Hereinafter, the present invention will be explained in detail based on the actual examples shown in the accompanying drawings.

Figure 2 is a plan view showing an embodiment of the present invention;
1~H"lji't (fa1 enlarged view. /Yanota in Figure 1 means that the leading blade group and trailing blade group made of Nyanota blades are in the longitudinal direction of the Nyanono opening 1. The so-called AII shift focal plane 7-Yanota is used for exposure by traveling in the direction of direct firing. A shirt opening 2 is provided, and this shirt opening D
2 is rotated by a leading blade group 3 consisting of a plurality of blades 6 Also, the other blade of the rear blade group 4 is rotated from the Yanok opening 2 with a wheel stand at one of the standby positions. “6-
I'm here. In FIG. 3, the tip blade liver 3, which is expanded to completely cover the opening 2, is a rectangular blade 2' supported by a tip blade drive arm 5 and an auxiliary arm 6, which constitute a known decagonal quadrilateral link mechanism. Al43a and its rectangular blade 3a
The structure is made up of five auxiliary blades 3+), 3c, 3d, 3e, and 3f, which cover the remainder of the opening 2 that cannot be removed. 1. Formed on the upper part of the rectangular blade 3a. The exposure edge E is formed parallel to the inner edge of the opening 1]2 in the longitudinal direction. Naive, what are the leading blade drive arm 5 and the auxiliary arm-6?
By means of the bottle shafts 7 and 8 installed in parallel to the base 1 of Yanota, 1.40 near 1. It is rotatably supported. Five auxiliary blades 3b to 3f are rotatably supported on the bottle shaft 8 that supports the auxiliary arm. These nine leading blade groups 3 are driven by the leading blade 1 drive lever 9 shown in FIG.
Anru. Still, the trailing vane group 4, like the leading vane phase group, also forms a parallelogram linkage - a rectangular vane supported by a trailing blade drive arm and an auxiliary arm (see Figure 3), and an auxiliary arm. 5 that can be rotated around the bottle shaft that supports the
After a predetermined delay n hours following the travel of the leading blade group 30, the blade group is configured to travel downward and unfold to fill the shutter opening 2 (7t).

As shown in FIGS. 1 and 2, the leading blade drive lever 9 that drives the leading blade group 3 is rotatably supported by a bottle shaft 10 embedded in the gloss base plate 1, and The blade driving spring 11 always urges the blade to rotate clockwise, and this rotation is prevented by the leading blade retaining pawl 12. The leading blade driving pin 13, which is installed at one end of the leading blade driving lever 9, passes through the circular arc groove 1a formed in the glossy base plate 1 with the pin shaft 10 as the center hole b, and drives the leading blade. Kakeru! IIυ arm 5 cam? ? 45a. The leading blade of the trench, the driving pin 13, is engaged with a cam groove (not shown) formed in each of the five auxiliary blades 3b to 3f.

On the other hand, in the rear blade group 4, similarly to the leading blade group 3, the rear barrel 4 release lever 9' is connected to the bottle shaft 1 mounted on the shutter base plate 1.
Rotatably supported by 0', rear blade 1 drive blade 11
The rear blade retaining pawl 12' allows the rear blade to rotate clockwise at all times. In addition, the rear blade drive huff 13' installed at one end of the rear blade 1 drive lever 9' is inserted through an arcuate groove 1b formed in the glossy base plate 1 with the tongue shaft 10' as the upper center. The rear blade 1 drive arm and the auxiliary blade are each configured to engage with a neatly formed cam groove (not shown).

A gear 14 is fixedly attached to the front blade and the drive lever 9, and both are configured to be able to rotate toward the center 9 of the bottle. A segment gear 15 that meshes with this gear 14 is rotatably supported by a pin shaft 16 provided in a section on the gloss base plate 1. A bending plate 17 is integrally fixed to the segment gear 15, and a bottle 18 is embedded in the bending portion 17a of the bending plate 17.

Further, a bearing stand 20 is fixedly installed on the shutter board 1.
The bowl part movement +1i1+ that engages with this bearing stand 20 with the bi/18
+19 is rotatably supported. #Drive shaft] 9
is parallel to the running surface of the leading blade 8+3 which is parallel to the shutter board J, and the axis of IIζ11 is parallel to the leading edge E of the leading blade group 30.
It is installed so that it is parallel to. Further, the flange portion i9a formed at one end of the pot moving shaft 19 is provided with a notch @19b that engages with the bottle 18 as shown in FIG. It is biased 2' by a spring 21 so as to be pressed against one wall surface of 19b. Due to the engagement of this notch @tAi 19b with the bin 18, the direction of the rotation of the gear 15 is changed and transmitted to the pot moving shaft 19 perpendicular to the bin iQt+16.

Basically, at the other end of the pot moving shaft 19, there is a counterbalancing sword'! A swinging arm 23 for supporting one end 22a of the arm 22 is fixedly mounted as shown in FIGS. 2 to 5. A support stand 24 is fixed on the shutter substrate 1 at a position opposite to the stand 20 with this counterweight 22 in between, and the support stand 24 is fixed on the shutter base plate 1 at a position opposite to the stand 20. A support shaft 25 is installed on the support base 24 in alignment with the jl line. This support 11N1+25 rotatably supports the swinging arm 2-3', which supports the other end 22b of the counterweight 22, via a pusher 26. Still, in order to integrally connect the counterweight 22, the swinging arm A, and the illusion, the balance #220
Both ends 22a1221] are formed in a step shape.
2a, 22bfd, as shown in Figures 5 and 6.
The JC swing arms 23 and 23' are crimped and connected by bent portions 23a and 23'a. Therefore, the counterweight 22 and the oscillating weight 23.23' are integrally capable of oscillating by -C around both i*11+ of the decorative part moving shaft 19 and the support spider 123. In this case, the counterweight 22 is placed close to the running surface of the leading blade group 30! Along with the sign, the kinematic meter of the counterweight 22 and the leading blade which are displaced in conjunction with the leading blade group 3! (τ
−3 momentum and a counterweight of 22
It is necessary to reduce the space occupied by Therefore, in order to reduce the displacement S of the counterweight 22 and to reduce the distance t from the center of gravity to the center of gravity, the inertia of the counterweight 2z is reduced by the inertia of the leading vane xry= In order to make the counterweight larger than the stock size, the counterweight 22 should be made of tantalum (Ta), which has a higher specific gravity than lead, or an alloy thereof, with a specific gravity of 1:5 or more. Also a metal with Q′! , the alloy is made of -C 7L.

FIG. 7 is a cross-sectional view of the embodiment shown in FIG. The light from the subject is a swinging mirror M.

A part of the light is reflected by the focusing plate SC, and the other part passes through the oscillating mirror M1, and then is reflected by the sub-mirror M, and passes through the iron lens L to -C. ″/ to electric conversion code f
It is configured to form an image on the IJ. A vertically running focal plane shutter is provided between the sub-mirror M and the film F, and a counterweight 22 is installed in an extremely narrow lower space S1 outside the path of the photometric light flux in front of the shutter substrate 1 on the front side of the shutter. Safuru. In this case, the counterweight 22 is small and its displacement is small, so it can be installed without any problem.

Since the first embodiment shown in FIGS. 1 to 7 is constructed as described above, when the release button (not shown) provided on the camera body is pressed, the leading blade latching lever is released by a known method. 12 rotates counterclockwise to release the restraint of the leading blade drive lever 9. As a result of the release, the leading blade drive lever 9 is rotated in the open direction due to the force of the leading blade driving spring 11.
The leading blade driving arm 5 is rotated clockwise through the leading blade driving pin 13, and with the help of the auxiliary lever 6, the rectangular blade 3a is translated in the -F direction. At the same time, the leading blade drive lever 9 rotates the leading blade and the auxiliary blades 31) to 3f clockwise around the pin shaft 8 through the driving pin 13, and rotates them together with the rectangular blade 3a below the opening 112. It is moved to the retracted position and exposure is performed.

- Force, this rotation of the leading blade drive lever 90 in the downward direction causes the gear 14 to rotate clockwise, causing the segment gear 15r meshing with the IL to rotate counterclockwise. This counterclockwise rotation of the segment gear 15 causes the bin 18 to rotate counterclockwise around the pin shaft 16 via the bending plate 17 fixedly attached to the segment gear 15 . Since the bin 18 is rotated in the counterclockwise direction, the bin 18 is displaced to the left in FIG. 4, the #AI drive +1111
Rotate the flange portion 19a k of 119 clockwise.

By this clockwise rotation of the flange portion 19a, the counterweight 22, together with the swinging arm 23, 23', connects both the bowl moving shaft 19 and the support shaft 25, and connects them as shown in chain lines in FIG. Rotate in the g-1 direction to the indicated position.

Therefore, the weight G of the counterweight 22 is displaced to the left by a distance S in FIG. This displacement direction is rectangular blade 3
This is the opposite direction to the traveling direction of a. In addition, the auxiliary blades 3b~
3f is rotationally displaced around the pin shaft 8, but the center of gravity of each auxiliary blade 3b to 3f is at the third position when the shutter is running.
In the figure, there is no significant displacement in the left-right direction (horizontal direction), but there is a large displacement only in the vertical direction (vertical direction), so the entire leading blade group including the rectangular blade 3af is considered to run in the vertical direction. be able to. In other words, it can be seen that the blade travels in a direction perpendicular to the exposed edge of the rectangular blade 3a. Therefore, the multiplicative product (rn, s) of the inertial mass (rn) of the counterweight 22 and the moving part S) of its center of gravity is approximately equal to the multiplicative product of the inertia of the leading blade group 3 and the amount of movement of its center of gravity. In other words, the counterweight 22 and the leading vane group 3 have approximately the same amount of momentum and move in opposite directions, so their reactions cancel each other out. In this case, the multiplicative product of the inertia of the leading blade group 3 and the center of gravity movement is the sum of the multiplicative products of the inertia purchase m' and the center of gravity movement S' for each blade (3a to 3f). (Σ
nl'·S'). Therefore, by making the inertial mass (m)' of the counterweight 22 sufficiently larger than the inertia of the leading blade group 3, even if the movement of the center of gravity (S) of the balancing weight 22 is extremely small, the leading blade group 3 (7) It is possible to take a lance and almost prevent vibrations caused by the movement of the leading blade of the camera body.

In the embodiment 2 of FIG. 1, the leading blade travels downward, the leading blade driving lever 9 drives the trailing blade, and is provided at a lower part than 2 is provided on the shutter substrate below. However, among longitudinally running type four-force replenishers, those in which the leading blade and the trailing blade run in the opposite direction (upward) to the shutter shown in FIG. 1 are also commonly used. FIG. 8 is a plan view showing a second embodiment of the present invention incorporated in a longitudinally running focal plane shutter of the type in which the blades run upward. This second embodiment corresponds to an upside-down version of the first embodiment shown in FIG. 1, and the functions of the components used therein are the same as those of the structure shown in FIG. Therefore, in the embodiment shown in FIG. 8, all members having the same functions as those in the first embodiment are designated by the same reference numerals as in FIG. 1, and a detailed explanation of the structure thereof will be omitted.

In the second embodiment shown in FIG.
The leading blade drive lever 9, which had been at t', is released from its restraint and rotates counterclockwise about the pin shaft 10 by the biasing force of the leading blade drive spring 11. By this rotation of the leading blade drive lever 9, the trailing blade 3 is driven through the leading blade drive bin 13.
travels upward.

- force and counterclockwise rotation of the leading blade drive lever 9,
The bin 18 rotates clockwise around the bin l1ql116 via the gear 14, the segment gear 15, and the bending plate 17, and the bowl part moving shaft 19 having the flange 1'9a and the swinging arm 2
3, the counterweight 22 is rotated downward as shown in Fig. , the specific gravity of the counterbalance 22 is approximately 1, which is larger than lead.
3.5 or more, the inertial mass of the counterweight 22 is configured to be greater than that of the leading blade. Therefore, in the second embodiment as well, the balance needle 22 can be made small and its displacement can be extremely small. However, since the PR bag space of this counterweight 22 only needs to be extremely small, in the second embodiment, the counterweight 22 is connected to the focusing plate SC by the upper blade of the oscillating midge M1 as shown in FIG. and the shutter board 1 in an extremely narrow space S of 1.

Can be installed inside.

FIG. 10 shows a configuration in which a trailing blade vibration isolator 6 is added to the leading blade vibration isolator shown in FIG. In the rear blade vibration isolator, similarly to the leading blade vibration isolator, the rear blade drive lever 9', which is biased upwardly by the rear blade drive spring 11', and the gear 14' are integrated. TL is supported by the rotating fiJ function on the bottle ql + s' which is planted on the 7 Yatsuta board]
, a segment gear 15 meshing with the gear 14' is rotatably supported by a pin shaft 16' implanted in the shutter base plate 1. A rear blade latching claw 12' that drives the rear blade and latches zgL, and a swinging arm 23 that supports a counterweight 22' from a bending plate 17' fixed to the segment gear 15'. Since the weight displacement machine l+14 in the support shaft 25' groove including 23A' and the vibration isolator for the leading blade are all constructed of the same members as in the embodiment shown in FIG. Further explanation will be omitted.

In the third flushing embodiment shown in FIG.
2 in Fig. 10 and travels downward at the same time as gear 14.
This is exactly the same as in the first embodiment shown in FIG. 1, in which the counterweight 22 is moved in one direction to prevent vibrations of the rotatable edge vane during running.

After a predetermined delay n time following the running of the leading blade 3, when the trailing blade retaining pawl 12' is rotated clockwise by known means,
Rear trunk 41 (drive lever 9'C, released) 1. Then, due to the biasing force of the rear blade drive spring 11', the blade rotates clockwise about the pin shaft 8', travels downward through the sickle blade (not shown) via the drive pin 13', and closes the 7-yen opening C12. 1, rear blade drive t/bar 9' and gear 14'
rotates in the opening direction, and rotates counterclockwise around the segment gear 15' and Kevin shaft 16'.

This rotation of the segment gear 15' in the counterclockwise 84 direction causes the 1J1 curved root 17' to rotate in the counterclockwise direction.
A swinging arm 23A fixed to the pot moving shaft 19' and a support via the pot moving shaft 19' rotatably supported on the bearing stand 20' A counterweight 22' whose both ends are supported by a swinging arm 23A' which is pivoted on a support shaft 25' installed in a stand 24' is moved upward in a direction opposite to the running direction (downward) of the rear blade. Displace to. Therefore, the vibration caused by the running of the trailing blade is also canceled out by the displacement of the counterweight 22'.

The above-mentioned rear blade vibration prevention device is effective when the camera vibration as a reaction to the running of the rear blade is extremely strong and cannot be substantially ignored. However, as is clear from a comparison between FIG. 1 and FIG. 10, if a vibration prevention device is also added to the rear blade, the weight and cost will double. However, regarding the leading blade, the displacement of the camera body due to the reaction when the blade is running (camera movement while the blade is running) and the vibration due to the restoring force of the camera support after the displacement (camera swing after the blade is running) are caused. Both of them cause camera shake, but the rear blade closes the shooting screen at the end of its run, so
The period in which the photographic screen is affected is only while the trailing blade is traveling. The camera displacement M (amount of camera displacement) due to this blade travel increases as the blade travels longer, that is, as the blade approaches point r on the blade travel path.
The camera light that is large enough to affect the photographic screen occurs only at the end of the trailing blade travel - and only in a small part of the exposed area.
do not. On the other hand, vibrations due to the restoring force of the camera support after the leading blade travels cause the camera to shake over the entire exposed photographic screen, and its influence is extremely large. Therefore, if it is possible to ignore the camera 7L while the trailing blade is running, it is not necessary to provide a counterweight that is linked to only the leading blade and not to the trailing blade. This makes it possible to compare -&t and cost.

Note that the longitudinally running focal plane shutter in the above embodiment is a chair! If, as shown in FIG. 3, the light shielding body includes a rectangular blade that moves in parallel by a parallelogram link mechanism including a drive arm and an auxiliary arm, and a bottle 1Uil to cover the remainder of the shutter opening that cannot be covered by this rectangular blade.
It is composed of a plurality of auxiliary blades that rotate around the center. However, the shutter used in the present invention is
A plurality of rectangular blades may be connected to the drive arm and the auxiliary arm constituting the parallelogram link mechanism so that the rectangular blades move in parallel together to open and close the shutter opening. Furthermore, since the vibration prevention device of the present invention can be installed in an extremely narrow space, it can be used not only for the focal plane shutter installed immediately before the film, but also for the view shutter installed immediately after the photographic lens. can also be effectively applied.

As described above, according to the present invention, it is possible to form a small counterbalance weight that moves in the opposite direction to the light shielding body in conjunction with the travel of the light shielding body, and the amount of displacement thereof can be made extremely small. It can be installed within a space and can sufficiently prevent camera movement.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a first embodiment in which the present invention is applied to prevent vibration of a leading blade; Fig. 2 is a 1-meter view of section II-■ in Fig.
Fig. 3 is a plan view showing the structure of the /Yanota blade in Fig. 1, Fig. 4 is a sectional view taken along IV-IV in Fig. 2, Fig. 5 is a sectional view taken along ■-■ in Fig. 2, and Fig. 6 is a sectional view taken along FIG. 2 is a sectional view taken along IV-IV in FIG. 2, FIG. 7 is a sectional view of a single-lens reflex camera equipped with the embodiment shown in FIG. The figure is a cross-sectional view of a single-lens reflex camera equipped with the embodiment shown in FIG. 8, and FIG. 10 is a plan view of a third embodiment of the present invention, which is used to prevent vibrations of both the leading blade and the trailing blade. ■.../Yasota board, 23.4...Light shield 19.19', 25.25'...Spin shaft 22.2
2'... Counterweight No. 1... Exposure edge application Person: Nippon Kogaku Co., Ltd. Agent Takao Watanabe

Claims (3)

[Claims] (1) In a camera shutter whose aperture is opened and closed by a pair of light shielding bodies traveling in one direction yc, at least one of the light shielding bodies has a larger inertia on the negative side than the other light shielding body. The counterweight is swingably supported by a diagonal support shaft provided parallel to the exposure edge of the light shield, and the RiJ counterweight moves the exposure edge in conjunction with the movement of the light shield. A vibration isolating device for a camera shutter, characterized in that the vibration isolating device is configured to be displaced in a direction opposite to the direction and the amount of displacement is shorter than the moving distance of the exposure edge. (2) One of the light blocking bodies opens the aperture↓1 light passing body (
3), characterized in that the counterweight (22 whales) is configured to be displaced in a direction opposite to the travel of the first light shield in conjunction with only the travel of the first light shield. The camera shutter vibration isolation device according to item 1. (3) The swing arm (23) supported by the support shaft (19, 25) on the shoulder of the counterbalance 22 (23) is solidly mounted on the support shaft (19, 25). The camera shutter vibration isolation device according to item 2.