JP3625317B2 - Film unit with lens with built-in flash - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a film unit with a built-in strobe lens and a built-in strobe device.
[0002]
[Prior art]
A film unit with a lens, in which an unexposed photographic film pulled out from a cartridge is built in a unit body that incorporates a simple shooting mechanism so that it can be taken easily at any time, has been manufactured and sold by the applicant and is widely used. Has been. In addition, in such a film unit with a lens, there is a film unit with a built-in strobe lens (hereinafter referred to as a film unit with a strobe) that incorporates a strobe device so that photographing can be performed even in a dark place.
[0003]
In the manufacture of a film unit with a stroboscope, a photographing mechanism, a stroboscopic device, a battery of the stroboscopic device, etc. are assembled to the base of the main body in which the cartridge chamber and the film storage chamber are formed, and a front cover is attached to the front of the main body base. Thereafter, the shutter operation and the strobe light emission are inspected, and those that pass this inspection are sent to the film loading process. The film loading process is performed in a dark room, and a cartridge and an unexposed photographic film drawn out from the cartridge are loaded into the cartridge chamber and the film storage chamber, respectively. Then, a rear cover is attached to the back of the main body base in which the cartridge and the photographic film are loaded to complete the unit main body. The completed unit body is packaged with an outer case such as a paper box. The outer case is provided with an opening that exposes a photographic lens, a shutter button, a viewfinder, and the like, and the film unit with a strobe can be photographed with the unit main body still in the outer case.
[0004]
By the way, a film unit with a strobe is known that automatically recharges a main capacitor after strobe light emission. In such a film unit with a strobe, the main capacitor is automatically charged after the strobe emission test. Therefore, if it is sent to the next film loading process in this state, if the synchro switch is turned on for some reason during the film loading process, the strobe device emits light erroneously, resulting in a photographic film being loaded. Fogging occurs. If fog occurs in a photographic film, the film unit with a strobe is not only defective, but if it is shipped and sold, it causes great inconvenience to the purchaser. In addition, when charging of the main capacitor is completed, a charging completion display lamp such as a neon tube lights up, even if the strobe device does not emit light erroneously, the light of this charging completion display lamp is used during the loading process. Fogging occurs in photographic film.
[0005]
For this reason, as shown in FIG. 4, discharge openings 51a and 51b are formed side by side on the front cover 51 of the unit body, and discharge pins 52a and 52b are inserted into the discharge openings 51a and 51b, respectively. All the electric charges charged in the main capacitor are discharged through a discharging resistor and then sent to the photographic film loading process. This prevents false light emission of the strobe during loading of the photographic film. After the unit main body is completed, the discharge openings 51a and 51b of the front cover 51 are hidden by an outer case that covers the unit main body so as not to be seen by the user.
[0006]
[Problems to be solved by the invention]
However, there are also users who tear the outer case themselves after taking a picture and take out the cartridge containing the photographed picture film from the unit body. At this time, if the outer case is completely removed, the discharge openings 51a and 51b are exposed, and if the user mistakenly inserts a metal such as a metal clip into the discharge openings 51a and 51b at the same time, the battery is charged. In addition, a high voltage of the main capacitor, for example, a voltage of 300V, may cause an accident such as an electric shock or burn to the user, which is very dangerous.
[0007]
The present invention has been made to solve the above problems, and provides a film unit with a built-in strobe lens capable of preventing an electric shock accident caused by a high voltage of a main capacitor due to insertion of a metal from a discharge opening. The purpose is to do.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, the charge charged in the main capacitor is obtained by inserting each discharge pin and connecting each discharge pin and each terminal of the main capacitor inside the unit body. The two discharge openings for discharging are separately provided on different surfaces of the plurality of surfaces of the unit body having a substantially rectangular parallelepiped.
[0009]
In the invention of claim 2, one of the two discharge openings is provided at a position on the upper surface of the unit body facing one terminal of the main capacitor, and the other discharge opening is Provided on the front surface of the unit body facing the conductive region connected to the other terminal of the main capacitor on the printed circuit board on which the components of the strobe device are mounted, and the one terminal of the main capacitor is the one discharge of the one And the other terminal is connected to the discharge pin inserted from the other discharge opening via the conductive region.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 2 showing the external appearance of a film unit with a built-in strobe lens (hereinafter referred to as a film unit with a strobe) according to the present invention, the film unit with a strobe includes a substantially rectangular parallelepiped unit main body 10 equipped with a photographing mechanism, and It is comprised from the outer case 11 to accommodate. The outer case 11 is provided with openings for exposing the photographic lens 12, viewfinder 13, winding knob 14, shutter button 15, strobe light emitting part 16, etc., and photographing with the unit body 10 placed in the outer case 11. The operation can be performed.
[0011]
A strobe light emitting unit 16 is arranged on the right side of the front surface of the unit body 11, and an operation button 17 is provided on the lower side thereof. When the operation button 17 is pressed, the booster circuit of the strobe device 23 operates to charge the main capacitor 30 (see FIG. 3). In this film unit with a strobe, if the operation button 17 is operated to start charging the main capacitor 30, even if the pressing of the operation button 17 is released immediately thereafter, the main capacitor 30 reaches the specified charging voltage. The operation of the booster circuit is maintained, and the booster circuit starts to operate each time strobe light is emitted. Therefore, it is not necessary to operate the operation button 17 for every photographing, and the operation button 17 is pressed only when the charging voltage of the main capacitor 30 is lowered. On the upper surface of the unit main body 10, there are provided a shutter button 15, a window 18 for confirming the number of frames that can be photographed, and a display window 19 for confirming that the preparation for flash emission is completed.
[0012]
As shown in FIG. 3, the unit main body 10 includes a main body base 21 into which a cartridge 20a and a photographic film 20b drawn out from the cartridge 20a are loaded, an exposure unit 22 and a strobe mounted on the front surface of the main body base 21. The photographic film 20b is optically sealed between the apparatus 23, the front cover 24 mounted on the front surface of the main body base 21 and covering the exposure unit 22 and the strobe device 23, and the rear surface side of the main body base 21. The rear cover 25 is housed. The exposure unit 22 includes a counter mechanism for displaying the number of frames that can be photographed, a shutter mechanism, a one-frame feeding mechanism for feeding a photographic film one frame at a time, a photographing lens 12, a viewfinder 13, and the like.
[0013]
The main body base 21 is provided with a cartridge chamber 21a in which the cartridge 20a is loaded, and a film storage chamber 21b for storing an unexposed photographic film 20b drawn out from the cartridge 20a and rolled. These bottom surfaces are openings and are closed by bottom lids 25 a and 25 b formed on the rear cover 25. The bottom lid 25a of the cartridge chamber 21a is freely opened and closed by engaging with a claw, and after all the frames of the photographic film 20b have been shot, a take-out lid for taking out the patrone 20a in which the photographed photographic film 20b has been wound. It becomes.
[0014]
The strobe device 23 includes a strobe light emitting unit 16 including a strobe discharge tube, a booster circuit, a sync switch 27, a battery 28, an electrode plate 29 for the battery 28, a main capacitor 30, and a strobe charge switch 31 mounted on a printed circuit board 26. Etc. The strobe charge switch 31 includes a metal piece 31a and a pair of conductive regions (lands) 31b exposed on the surface of the printed circuit board 26. The metal piece 31a is pressed by the pressing operation of the operation button 17, and a pair of conductive regions is formed. It turns on when it contacts 31b. When the strobe charging switch 31 is turned on, the booster circuit is operated using the battery 28 as a power source, the low voltage of the battery 28 is boosted to a high voltage, for example, about 300 V, and the main capacitor 30 is charged with this high voltage.
[0015]
In the strobe device 23, for example, the booster circuit is restarted by a pulse voltage generated when a current instantaneously flows when the electric charge of the main capacitor 30 is discharged in the strobe discharge tube, and the strobe light is emitted. Each time it is done, the main capacitor 30 is recharged. When the main capacitor 30 is discharged by a discharge resistor 45 described later, the pulse voltage is lowered because the discharge time is long, and the booster circuit is not restarted.
[0016]
Further, the strobe device 23 is provided with a neon tube 34, and when the main capacitor 30 is charged to a specified charging voltage (for example, 300V), the neon tube 34 is turned on and the strobe light emission is ready. Is displayed. The neon tube 34 is arranged at a position facing the display window 19, and the photographer can check whether the neon tube 34 is lit or not from the display window 19. The electric charge charged in the main capacitor 30 is discharged in the strobe discharge tube when the synchro switch 27 is turned on in synchronization with the operation of the shutter. As a result, the strobe discharge tube emits light and the strobe light emitting unit 16 emits strobe light.
[0017]
As shown in FIG. 1, a strobe light emitting unit 16 is disposed on an upper portion of a printed circuit board 26, and a main capacitor 30 is disposed behind the strobe light emitting unit 16. In addition, a discharge terminal 40 made of a conductive region not coated with a resist formed on the surface of the printed circuit board 26 is connected to one terminal (a positive terminal in FIG. 1) 30 a of the main capacitor 30. When the front cover 24 is attached to the main body base 21, the printed circuit board 26 is behind the front surface 24a of the front cover 24, and the other terminal of the main capacitor 30 (the negative side in FIG. Terminal) 30b.
[0018]
On the front surface 24a of the front cover 24, a discharge opening 41 is formed at a position facing the discharge terminal 40, and a discharge opening 42 is formed at a position of the upper surface 24b facing the terminal 30b of the main capacitor 30. ing. A pair of discharge pins 43 and 44 of the discharge unit are inserted into these discharge openings 41 and 42 before the film loading process. In this discharge unit, discharge pins 43 and 44 are connected via a discharge resistor 45, and one discharge pin 43 is in contact with the discharge terminal 40 to be connected, so that the tip of the discharge unit 43 is in the shape of a hole. The other discharge pin 44 has an inverted U-shaped tip for direct contact with the terminal 30b of the main capacitor 30 for connection.
The discharge pin 43 is inserted into the front cover 24 from the front surface 24a side of the front cover 24 through the discharge opening 41 and comes into contact with the discharge terminal 40, thereby being electrically connected to one terminal 30a of the main capacitor 30. Connected. The discharge pin 44 is inserted into the front cover 24 from the upper surface 24b side of the front cover 24 through the discharge opening 42, and is in direct contact with and electrically connected to the other terminal 30b of the main capacitor 30. Is done. As a result, the charge charged in the main capacitor 30 is discharged by the discharging resistor 45 via the discharge pins 43 and 44.
[0020]
In this manner, by disposing the discharge openings 41 and 42 for discharging the main capacitor 30 separately on different ones of the outer surfaces constituting the substantially rectangular parallelepiped unit main body 10, the outer case 11 is separated from the unit main body 10. When removed, it is difficult for the user to insert a metal piece or the like into the discharge openings 41 and 42 at the same time. Of course, it goes without saying that there is a risk of electric shock if a metal piece or the like is placed around the discharge openings 41 and 42.
[0021]
Next, the operation of the strobe-equipped film unit configured as described above will be described. The assembly of the unit main body 10 is performed in a bright room except for the mounting of the rear cover 25 and the loading of the cartridge 20a and the photographic film 20b. The main body base 10 is transported with the front side facing up or down, and the winding knob 14, exposure unit 22, strobe device 23, and the like are assembled therebetween.
[0022]
After the winding knob 14 is assembled, the exposure unit 22 assembled with the counter mechanism, the shutter mechanism, the one-frame feed mechanism, the photographing lens 12, the finder 13 and the like is assembled from the front surface of the main body base 21. Next, a strobe device 23 on which a booster circuit, a strobe light emitting unit 16, a sync switch 27, an electrode plate 29 for a battery 28, a main capacitor 30 and the like are mounted is mounted on the front surface of the main body base 21. Furthermore, after the metal piece 31a of the strobe charging switch 31 is arranged at a predetermined position, the front cover 4 is assembled to the front side of the main body base 21 so as to cover them. The battery 28 is loaded between the electrode plates 29 from the bottom side of the main body base 21. The battery 28 may be loaded before the front cover 24 is attached.
[0023]
After the front cover 4 is assembled, the main body base 21 is sent to the inspection process of the shutter mechanism and strobe device 23 to inspect the operation of the shutter, lighting of the neon tube 34, strobe emission, and the like. In the strobe light emission test, the operation button 17 of the front cover 24 is pressed to operate the booster circuit, and the main capacitor 30 is charged. When the lighting of the neon tube 34 is confirmed and it is determined that the main capacitor 30 has reached the specified charging voltage, the shutter is activated and the strobe device 23 emits light. Then, it is determined whether or not the strobe light is emitted and whether or not the strobe light emission and the shutter operation are synchronized.
[0024]
The main body base 21 that has passed the strobe light emission inspection is sent to the next film loading step. When strobe light emission is performed in this inspection, the main capacitor 30 is instantaneously discharged, and at this time With the generated pulse voltage, the booster circuit is reactivated and the main capacitor 30 is charged again. For this reason, after the end of the strobe light emission inspection (before sending it to the film loading step), the main capacitor 30 is discharged using the discharge unit.
[0025]
In the discharge of the main capacitor 30, as shown in FIG. 1, the discharge pin 43 is inserted into the front cover 24 from the front surface 24a side of the front cover 24 through the discharge opening 41, and the discharge pin 43 and the discharge While being in contact with the terminal 40, the discharge pin 44 is inserted into the front cover 24 from the upper surface 24 b side through the discharge opening 42, and is in contact with the discharge pin 44 and the terminal 30 b of the main capacitor 30. As a result, the discharge resistor 45 is connected to both terminals 30a and 30b of the main capacitor 30, and all the charges charged in the main capacitor 30 are discharged through the discharge resistor 45. No charge state. After a predetermined time necessary for discharging all the electric charges of the main capacitor 30, the discharge pins 43 and 44 are extracted. In the discharge by the discharge resistor 45, the pulse voltage is low, so that the booster circuit is not reactivated, and the non-charged state of the main capacitor 30 is maintained even after the discharge pins 43 and 44 are extracted.
[0026]
On the other hand, for those that fail the inspection, after discharging the main capacitor 30 in the same manner as the one that passed, it is better to sort toward the line for failure. In this way, it is possible to prevent an electric shock accident due to the electric charge charged in the main capacitor 30 when disassembling the rejected main body base 21.
[0027]
The main body base 21 that has passed the strobe light emission test and in which the main capacitor 30 is not charged by the discharge unit is transported to the film loading process in the dark room. In this film loading process, the cartridge 20a is loaded into the cartridge chamber 21a from the bottom. Thereafter, the roll-shaped photographic film 20b drawn out from the cartridge 20a is stored in the film storage chamber 21b of the main body base 21, the rear cover 25 is assembled on the back side of the main body base 21, and the bottom lids 25a and 25b are bent. Then, the bottom surfaces of the cartridge chamber 21a and the film chamber 21b are closed. In this way, the inside of the main body base 21 is shielded from light, and the unit main body 10 is completed.
[0028]
By the way, if the strobe light emitting section 16 emits light or the neon tube 34 is lit while the film is being loaded, the photographic film 20b being loaded is sensitive to strobe light or light from the neon tube 34, and fogging occurs. However, as described above, since all the electric charges charged in the main capacitor 30 are discharged by the discharge unit before entering the film loading process, the strobe light emitting unit 16 emits light during the film loading. The neon tube 34 does not light up. Therefore, fog does not occur in the photographic film 20b being loaded.
[0029]
The completed unit main body 10 is transported to the bright room and subjected to various function tests, and then the outer case 11 is attached to complete the film unit with strobe. As shown in FIG. 2, the discharge openings 41 and 42 are covered with the outer case 11 so as not to be exposed to the outside. This prevents foreign matter from entering the unit body 10 from the discharge openings 41 and 42 and prevents the user from putting metal pieces or the like into the discharge openings 41 and 42 during use of the film unit with strobe. This will prevent an electric shock accident.
[0030]
Further, when the main capacitor 30 is charged, for example, in order for the user to take out the cartridge 20b from the unit body 10, the outer case 11 is removed and the discharge openings 41 and 42 are exposed. 41 and 42 are separately arranged on different surfaces of the unit main body 10, so that it is difficult for the user to insert metal pieces or the like into the discharge openings 41 and 42 at the same time. Can be prevented. Needless to say, even if a metal piece or the like is inserted into one of the discharge openings 41 and 42, no electric shock is caused.
[0031]
In addition, when the film unit with a strobe is recovered for recycling and the film unit with a strobe is disassembled, the discharge pins 43 and 44 are inserted into the discharge openings 41 and 42 to discharge the main capacitor 30. If the disassembly work is carried out after this, an electric shock accident during the disassembly work can be prevented.
[0032]
In the above description, a strobe device is described in which recharging is performed each time the strobe light is emitted. In addition, when charging the main capacitor, press the operation button until the main capacitor reaches the specified charging voltage to keep the strobe charge switch ON, or once every strobe shooting If the strobe charging switch is turned ON once by pressing, the strobe device may be configured so that the main capacitor is charged to the specified charging voltage even if the strobe charging switch is turned OFF immediately thereafter.
[0033]
In addition, the position of the discharge opening is not limited to the combination of the upper and front surfaces of the front cover, but may be changed as appropriate according to the position of the printed circuit board, the position of the main capacitor, the assembly of the unit body, and the order of loading the photographic film. It's okay. Furthermore, since it is conceivable that the strobe charge switch is turned on due to vibration during conveyance, etc., it may be sent to the film loading process with the discharge pin inserted. Moreover, you may provide a discharge unit in the conveyance pallet which conveys a main body base to a film loading process.
[0034]
【The invention's effect】
As described above, according to the film unit with a built-in strobe lens of the present invention, in order to discharge the main capacitor, the two discharge openings for inserting the discharge pins are provided in the plurality of substantially rectangular unit bodies. Since it is difficult to insert a metal piece or the like into the two discharge openings at the same time, it is possible to prevent an electric shock accident of the user due to the high voltage of the charged main capacitor. it can.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a positional relationship between a strobe device and a discharge opening.
FIG. 2 is a perspective view showing an appearance of a film unit with a built-in strobe lens according to the present invention.
FIG. 3 is an exploded perspective view showing a unit main body of a film unit with a built-in strobe lens.
FIG. 4 is a perspective view showing the position of a conventional discharge opening.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Unit main body 16 Strobe light emission part 23 Strobe device 24 Front cover 26 Printed circuit board 30 Main capacitor 41, 42 Discharge opening 43, 44 Discharge pin 45 Discharge resistance

Claims (2)

Two discharge openings into which discharge pins are respectively inserted are provided in a unit body including a strobe device including a main capacitor charged with a high voltage and a photographing mechanism, and each discharge pin is inserted through each discharge opening. In the film unit with a built-in strobe lens, which can discharge the electric charge charged in the main capacitor by connecting each discharge pin and each terminal of the main capacitor inside the unit main body,
The film unit with a built-in strobe lens, wherein the two discharge openings are provided separately on different surfaces of the plurality of surfaces of the unit body having a substantially rectangular parallelepiped. One discharge opening of the two discharge openings is provided at a position on the upper surface of the unit body facing one terminal of the main capacitor, and the other discharge opening is mounted with a component of the strobe device. A discharge pin that is provided on the front surface of the unit body facing the conductive region connected to the other terminal of the main capacitor on the printed circuit board, and wherein the one terminal of the main capacitor is inserted from the one discharge opening; 2. The film unit with a built-in strobe lens according to claim 1, wherein the film unit is connected directly and the other terminal is connected to a discharge pin inserted from the other discharge opening through the conductive region. .

Images