JPH08136974A - Shutter inspection device - Google Patents

Abstract

PURPOSE: To provide a shutter blade inspection device capable of easily inspecting the assembling state and the actuating state of a shutter blade from the outside. CONSTITUTION: The shutter blade inspection device 40 is constituted of an actuator 41 for operating a projection 19a for operating the shutter blade, a CCD camera 43 for picking up the image of a shutter aperture, an infrared lamp 44 illuminating the aperture direction of a shutter, an image memory 45 storing the shape pattern of the shutter aperture whose image is picked up by the camera 43, a pattern memory 46 for opening the shutter blade of an excellently acting film unit with a lens by a fixed angle and storing reference image data whose image is previously picked up, an image comparison circuit 47 comparing the image data of the memory 45 with the image data of the memory 46 and outputting the compared result and a controller 48 outputting an abnormality signal when the compared result transmitted from the comparison circuit 47 results in inequality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter blade inspecting device for easily inspecting a mounting state of shutter blades by image processing.

[0002]

2. Description of the Related Art As is well known, a shutter blade incorporated in a shutter mechanism of a lens-fitted film unit is one of the most important parts for exposing a subject image onto a photographic film. Conventionally, a shutter blade of a film unit with a lens has a single-blade shutter blade, but recently, there is a shutter blade of a double-blade structure to obtain a high-speed shutter operation.

As described above, the shutter blade is one of the most important components of the lens-fitted film unit.
If, for example, the shutter blades are forgotten to be attached, the number of sheets is insufficient, or there is a malfunction, proper photography cannot be performed. For this reason, during the manufacture of the lens-fitted film unit or at the time of completion of the manufacture, it is inspected whether or not the shutter is properly assembled.

Such a shutter inspection is simply by visual observation, or when the inspection is performed automatically, light is emitted in the shutter blade direction at the open position or the closed position of the shutter blade. However, it is common to detect forgetting to attach the shutter blade or the like based on the difference in the amount of reflected light depending on the presence or absence of the shutter blade.

[0005]

However, in the shutter inspection by the above-mentioned visual observation, it is checked from outside the lens-fitted film unit through the taking lens whether or not the shutter blades are securely attached and operate normally. It requires a certain amount of skill to inspect and confirm with, and
There are many problems in terms of production efficiency.

In addition, with the inspection method using the reflected light of the light emitted in the direction of the shutter blade, it is possible to detect that the shutter blade has not been attached, but it is very difficult to inspect for malfunction of the shutter blade. When the number of shutter blades is increased, it is difficult to detect some of the shutter blades due to the difference in the amount of reflected light, if only some of the shutter blades are not attached.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a shutter inspection apparatus capable of easily inspecting the assembling and operating states of shutter blades of a lens-fitted film unit from the outside through a taking lens. And

[0008]

In order to solve the above problems, in a shutter inspection apparatus according to the present invention, an actuator for holding a shutter drive member for opening and closing a shutter blade while moving it by a certain amount, and an appropriate shutter. Of the shutter opening shape pattern obtained when the shutter drive member is moved by a certain amount as reference image data, and the shutter drive member of the shutter to be inspected is moved by the actuator by a certain amount and is held. ,
By comparing the image data obtained by this image pickup device and the reference image data read out from the memory with the image pickup means for picking up the image data of the shape pattern of the shutter aperture and the reference image data read out from the memory, whether the shutter blade is opened or closed is determined. A determination means for determining is provided.

Further, according to a second aspect of the present invention, the shutter blade is incorporated behind the taking lens, and the image pickup means takes an image of the shape pattern of the shutter opening through the taking lens.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, a telephoto type lens-fitted film unit having a shutter blade operating protrusion capable of operating the shutter blade from the outside of the main body will be taken up. 2 is an external perspective view showing an example of a telephoto type lens-fitted film unit capable of inspecting shutter blades by the shutter inspection apparatus of the present invention, and FIG. 3 is an exploded perspective view thereof. The lens-fitted photo film unit 2 is roughly divided into a main body portion 3, a photographing mechanism 4 attached to the main body portion 3, a front cover 5 and a rear cover 6 which are fixed by front and rear pawls.

The photographing mechanism 4 includes a photographing lens 7, a finder 8, a shutter unit 9, a remaining film number display window 11,
A diaphragm switching lever 12 and the like are also provided. The taking lens 7 is a telephoto lens which is composed of two plastic lenses and has a focal length of 100 mm. The finder 8 is a Galileo type finder composed of two finder lenses, and a colored filter is arranged between these finder lenses so that the colored filter can freely come in and out.

As shown in FIG. 4, the shutter unit 9 is composed of a shutter base 14, a pair of shutter blades 15 and 16 having the same shape, and a shutter cover 17. The shutter base 14 is integrally formed with a shutter opening 14a provided on the optical axis and a protective plate 14b that covers the back surface of the reflection mirror. Further, the shutter cover 17 has a diaphragm opening 17a formed on the optical axis.

The pair of shutter blades 15 and 16 are rotatably arranged around two shafts 14c and 14d formed on the shutter base 14, respectively. An engaging hole 15 into which a connecting pin 18a of a shutter driving member 18 axially mounted in parallel with the optical axis is inserted between the shafts 14c and 14d through an opening 14e of the shutter base 14.
a and 16a are provided respectively.

As a result, when the shutter drive member 18 rotates, the shutter connecting pin 18a simultaneously opens and closes the pair of shutter blades 15 and 16. Shutter blades 15,
The opening and closing of 16 is performed between a closed position where the shutter opening 14a shown in FIG. 5 is closed and an open position where the shutter opening 14a shown in FIG. 6 is fully opened. Since this opening and closing is performed by the two shutter blades 15 and 16, the opening and closing is instantaneously performed, which contributes to prevention of exposure unevenness.

A rotary lever 19 is engaged with the sliding groove 18b of the shutter driving member 18. Rotating lever 19
Rotates by shutter release operation in the shutter charged state. A spring 22 is provided between the shutter blade operating projection 19 a provided on the rotary lever 19 and the projection 21 provided on the frame of the photographing mechanism 4 to rotate the rotary lever 19 counterclockwise. Is urged to. When the lens-fitted film unit 2 is inspected, the shutter blade operating protrusion 19a is engaged with an operating rod 41a provided on an actuator 41 of a shutter inspection apparatus, which will be described later, to open and close the shutter blades 15 and 16 from the outside.

The aperture switching lever 12 is for selecting one of the daytime shooting mode and the night view shooting mode, and the daytime shooting mode is selected at the position A shown in FIG. Slide operation to the left end of B
The night view shooting mode is selected depending on the position. In the daytime shooting mode, which is used when the subject is bright such as outdoors in the daytime, the filter enters the viewfinder 7 and, in conjunction with this, an aperture plate (not shown) having a small aperture opening formed therein. ) Is set in the lens barrel. This limits the diameter of the shutter opening and prevents overexposure.

A photo film chamber 25 and a film roll chamber 26 are formed on both ends of the main body 3, and a photo film patrone 27 and a photo film roll 28 pulled out from the photo film patron 27 are housed inside. . Also, Patro
A winding knob 29 for engaging the spool of the photographic film patrone 27 to wind the photographic film is provided on the upper portion of the chamber 25.

The front cover 5 is provided with holes for exposing the taking lens 7, the viewfinder 8 and the like.
A release button 31 is integrally provided on the upper surface. The rear cover 6 has a patrone chamber bottom lid 32 and a film roll chamber bottom lid 33 formed integrally with each other, and after the rear cover 5 is put on the back surface of the main body portion 3, the patrone chamber bottom lid 32 is removed. The bottom of the film chamber 25 and the bottom of the film roll chamber 33 cover the bottom of the film chamber 25 in a light-tight manner.

FIG. 1 is an explanatory diagram showing the structure of a shutter inspection apparatus embodying the present invention. Shutter inspection device 40
Is an actuator 41 that is driven by a driver 42 to mechanically operate the shutter blade operating protrusion 19a, and a CCD camera 4 that is an imaging unit that images the shutter opening 14a.
3, an infrared lamp 44 that illuminates the direction of the shutter opening 14a at the time of this image capturing, an image memory 45 that stores the shape pattern of the shutter opening captured by the CCD camera 43,
A pattern memory 46 for storing reference image data obtained by opening the shutter blades 15 and 16 of the lens-fitted film unit 2 operating at a predetermined angle at a predetermined angle, and storing the image stored in the image memory 45 and the pattern memory 46. An image comparison circuit 47 for comparing the image being displayed with the comparison result and outputting the comparison result, and interlocking these respective parts,
The controller 48 is configured to output an abnormal signal when the comparison results sent from the image comparison circuit 47 do not match.

The actuator 41 is internally provided with an electromagnetic cylinder, and moves up and down an arc-shaped operation rod 41a whose tip is concave so as to engage with the shutter blade operation protrusion 19a of the object to be inspected. As a result, the shutter blades 15 and 16 are opened from the outside to a preset inspection position between the closed position and the open position. Although the photographic film has already been loaded on the object to be inspected, since the shutter inspection device 40 is entirely installed in the dark room, the loaded photographic film is not exposed.

The CCD camera 43 includes an actuator 41.
Captures the image of the shutter opening 14a formed by lowering the shutter blade operation protrusion 19a to the inspection position as a black and white binary image. At this time, the infrared lamp 44 emits light by the synchronizing signal output from the CCD camera 43. The infrared light emitted from the infrared lamp 44 does not expose the ordinary daylight type photographic film loaded in the lens-fitted film unit 2 or the like,
Moreover, the light is in the wavelength range that can be reliably received by the CCD camera 43.

The image comparison circuit 47 reads out the shutter opening image of the object to be inspected and the reference image data from the image memory 45 and the pattern memory 46 and compares them with each other and compares them with each other. Since the shutter blades 15 and 16 are opened and imaged up to the same inspection position as described above, if the shutter blades 15 and 16 of the inspection object are operating normally, the image of the shutter opening is the reference image data. It will match.

Next, the operation of the above embodiment will be described. Shutter blade 1 of film unit with lens 2
When inspecting 5, 16 with the shutter inspection device 40 of the present invention, first, the lens-fitted film unit 2 is placed at a predetermined position of the shutter inspection device 40 so that the CCD camera 43 is accurately positioned in front of the taking lens 6. Set to. Then, when the shutter inspection device 40 is operated, first, the tip of the shutter blade operating projection 19a enters and engages with the tip of the operating rod 41a of the actuator 41.

A shutter blade operating protrusion 19 is attached to the operating rod 41a.
When a is engaged, the actuator 41 moves the operation rod 41a to the same inspection position as when the normal shutter opening image previously stored in the pattern memory 46 was captured. As a result, the shutter blades 15 and 16 are opened to the inspection position via the shutter blade operating protrusion 19a, and
The deformed diamond-shaped shutter opening 14a shown in (A) is formed.

When the operation of the actuator 41 is completed,
The controller 48 sends an image pickup start signal to the CCD camera 43. When the image pickup start signal is sent, the CCD camera 4
Reference numeral 3 sends a synchro signal to the infrared lamp 44 to turn on the infrared lamp 44 and image the shutter opening 14a formed by the shutter blades 15 and 16 via the taking lens 6.

The image of the shutter opening 14a is recorded by binary image recording of the shape pattern of the shutter opening 14a by using the infrared light emitted from the infrared lamp 44 as a light source. Then, the captured binary image of the shutter opening 14 a is stored in the image memory 45. The normal daylight film used for the lens-fitted film unit 2 is
Since it hardly reacts to the infrared wavelength region, the shutter opening 14
Even if infrared rays enter from a, the built-in photographic film is not exposed.

When the image pickup of the shutter opening 14a of the inspection object is completed and stored in the image memory 45, the image comparison circuit 4
Reference numeral 7 reads out the image data stored in the image memory 45 and the reference image data stored in the pattern memory 46 which is obtained by opening the normally operating shutter blades 15 and 16 to the inspection position and capturing the image. Then, it is compared whether these two images match.

When the shutter blades 15 and 16 of the object to be inspected operate normally, the image data stored in the image memory 45 and the pattern memory 46, which are taken by opening the shutter blades to the same inspection position, are taken. Naturally, it matches the stored reference image data.

However, if the shutter blades 15 and 16 are defective such that they do not operate for some reason, the situation shown in FIG.
As shown in (B), the shutter opening is not formed in the image data stored in the image memory 45, and naturally, it does not match the reference image data stored in the pattern memory 46. If the shutter blades 15 are not assembled due to an assembly error or the like, the image data of the shape pattern stored in the image memory 45 is displayed as shown in FIG. 7C. , A shutter opening 14b that is completely different from the shape of the reference image data is formed, and in this case, of course, it does not match the reference image data stored in the pattern memory 46.

As described above, the image comparison circuit 47 reads out and compares the image data of the shape pattern stored in the image memory 45 and the reference image data stored in the pattern memory 46, and compares the results. It is sent to the controller 48 as a comparison signal.

The controller 48 receiving the comparison signal from the image comparison circuit 47 judges that the shutter blades 15 and 16 of the object to be inspected operate normally when the comparison signal indicates that the two images match. Then, the inspection of the next object to be inspected is started. If the comparison signal indicates that the two images do not match, an abnormal signal is output to notify the operator.

In the above-mentioned embodiment, the telephoto type lens-fitted film unit is taken as an example of the object to be inspected. However, by changing the reference image data stored in the pattern memory, one shutter blade, Or 3
A lens-fitted film unit having more than one sheet can be inspected in exactly the same manner.

Further, in the above-described embodiment, the CCD camera is used as the image pickup device, but of course, other than this, various image pickup devices such as a television camera are used to perform A / D conversion of image data, Shutter opening image data of the inspection object may be stored in the image memory by binarization.

Further, in the above-mentioned embodiment, the example of the film unit with lens is taken as the non-inspection object,
Of course, the inspection of shutters of various cameras and the like can be performed in exactly the same manner.

[0035]

As described above, according to the shutter inspection apparatus of the present invention, the actuator for holding the shutter driving member for opening and closing the shutter blades in a state of being moved by a certain amount, and the shutter driving member for the proper shutter are provided. A memory that stores the shape pattern of the shutter opening obtained when moving a certain amount as reference image data, and the shutter drive member of the shutter to be inspected is moved by a certain amount by the actuator and held, and the shutter opening An image pickup means for picking up the image of the shape pattern and taking in the image data, and a decision means for comparing the image data obtained by the image pickup means with the reference image data read from the memory to judge whether the shutter blades are properly opened or closed. Since the and are provided, it is easy to set the shutter blades and operate them from the outside through the photographic lens. It has become possible to 査.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a shutter inspection device of the present invention.

FIG. 2 is a perspective view showing the external appearance of a lens-fitted film unit that is an object to be inspected of the shutter inspection apparatus of the present invention.

FIG. 3 is an exploded perspective view of FIG. 2;

FIG. 4 is an explanatory view showing the shutter mechanism of FIG.

FIG. 5 is an explanatory diagram in the closed position of FIG.

FIG. 6 is an explanatory view in the open position of FIG.

FIG. 7 is an explanatory diagram showing an example of a shutter opening image by the shutter inspection device of the present invention.

[Explanation of symbols]

 2 Film unit with lens 3 Unit body 7 Photographing lens 14a Shutter opening 15, 16 Shutter blade 19a Shutter blade operation protrusion 40 Shutter inspection device 43 CCD camera 45 Image memory 46 Pattern memory 47 Image comparison circuit 48 Controller

Claims (2)

[Claims] 1. A shutter inspection device that opens and closes shutter blades by moving a shutter driving member and performs exposure through a shutter blade and an exposure opening or a shutter opening formed between the shutter blades. An actuator that holds the shutter in a moved state, a memory that stores, as reference image data, a shape pattern of a shutter opening obtained when the shutter drive member of the appropriate shutter is moved by the certain amount, and a shutter that is an inspection target. An image pickup means for picking up the image data by picking up the shape pattern of the shutter opening while holding the shutter drive member moved by the actuator by a certain amount, and the image data obtained by the image pickup means and the data read from the memory. Whether the shutter blades are open or closed by comparing with the reference image data Shutter inspection apparatus characterized by comprising a determination determining means. 2. The shutter blade is incorporated behind a taking lens, and the imaging means takes an image of the shape pattern of the shutter opening through the taking lens.
The shutter inspection device described.