JPH0237570B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention enables trimming by enlarging a negative film image and adjusting it to a predetermined size by blocking a part of the exposure opening of a negative mask while viewing the image projected on a screen. The present invention relates to a negative mask that can be used as a normal negative feed type mask by opening the shielding part.

When enlarging a negative mask image and printing it on photographic paper, a trimming operation is commonly used to remove unnecessary parts, but traditionally this operation has been done by displaying the image frame according to the various sizes of photographic paper. Trimming is performed by enlarging and projecting a negative film image onto a screen and blocking a portion of the image with a paper mask to match the desired size of photographic paper. However, this method was complicated to operate.

In view of the current situation, the present invention provides a negative mask in which a negative holding plate is rotatably supported so that a negative film can be held against the negative mask main body, and a storage box is fixed to the lower surface of the negative mask main body or the upper surface of the negative holding plate. In the storage box, an exposure opening through which the negative mask main body, the negative presser plate, and the storage box communicate is slid in the front and back direction along a guide member provided in the storage box, so that the exposure opening two approximately L-shaped adjustment plates that adjust the degree of opening in the direction;
The degree of opening of the exposure opening in the left and right direction is adjusted by sliding it in the left-right direction of the exposure opening along a guide member provided on the lower surface of the negative mask body that fixes the storage box or on the upper surface of the negative holding plate. A negative mask is provided with two approximately L-shaped adjustment plates for adjustment, and a magnet capable of maintaining the position of the adjustment plates along the sliding direction of the adjustment plates is installed in the storage box and fixed to the storage box. By attaching it to the bottom surface of the main body or the top surface of the negative presser plate, you can adjust the exposure opening to the desired size by simply sliding the adjustment plate back and forth and left and right. Trimming that allows trimming to be carried out while reliably holding the position and not shifting due to unexpected vibrations.Furthermore, when trimming, the adjustment plate can be opened and normal baking can be performed. This invention makes it possible to provide a dual-purpose negative mask, and the present invention will be described in detail below with reference to illustrated embodiments.

In the figure, reference numeral 1 denotes a negative mask for trimming, and the negative mask 1 mainly includes a negative holding plate 2, a negative mask body 3, an adjustment plate 4 for adjusting the degree of opening of the exposure opening, and a storage box 5. The negative holding plate 2 and the negative mask body 3 have an exposure opening 7 approximately in the center thereof, which approximately matches the image on the negative film.
8, and a bent protrusion 9 at the rear end.
9, 10, and 10, which are rotatably supported by pins so that a negative film can be inserted and held between the negative holding plate 2 and the negative mask main body 3. 1
Reference numeral 1 designates a film guide protrusion implanted in the negative mask body 3 to regulate the position of the negative film, and reference numeral 12 designates a through hole drilled in the negative holding plate 2 for inserting the film guide protrusion 11.

A storage box 6 having an opening 14 that is slightly larger than the exposure openings 7 and 8 is fixed to the lower surface of the negative mask body 3, and a storage box 6 having an opening 14 that is slightly larger than the exposure openings 7 and 8 is provided in the box. Four L-shaped adjustment plates 4, 4, 5, and 5 are housed. The two adjustment plates 4, 4 are slid in the front and back direction to open the exposure opening 8.
This is for adjusting the degree of opening in the front-rear direction of the adjustment plates 4, 4, and long holes 15, 15 are provided in the front-rear direction of the adjustment plates 4, 4.
is drilled therein, and can be slid in the direction of the projections 16, 16 by fitting projections 16, 16 as adjustment plate guide members fixed to the lower surface of the negative mask main body 3. Adjustment plates 4, 4 have arms 17, 17
is extended, and its tips protrude from cutouts 18, 18 provided on the side surface of the storage box 6 so that it can be operated by an operator. Furthermore, adjustment plates 4, 4
Magnets 19, 19 made of an elastic material are fixed to the lower surface of the negative mask body 3 in order to securely hold the negative mask body 3 in a predetermined position.

The two adjustment plates 5, 5 are for sliding in the left-right direction to adjust the degree of opening of the exposure opening 8 in the left-right direction. By fitting into the protrusions 21, 21 as adjusting plate guide members provided on the bottom surface of the storage box 6, the arm 2 is fitted to the adjusting plates 5, 5 in the same way as the adjusting plates 4, 4.
2 and 22 are extended and protrude from cutouts 23 and 23 bored in the side of the storage box 6 so that the operator can operate them, thereby ensuring that the positions of the adjustment plates 5 and 5 are maintained. Magnet 2 made of elastic material is used to
4 and 24 are fixed to the bottom surface of the storage box 6.

In the figure, the adjustment plates 4, 4, 5, 5 have long holes 1.
5, 15, 20, 20, and projections 1 as guide members are provided in the negative mask body 3 and the storage box 6.
6, 16, 21, 21, but conversely, protrusions are provided on the adjustment plates 4, 4, 5, 5, and the negative mask body 3
It is also possible to make a long hole in the storage box 6.
In addition, in the figure, a storage box 6 equipped with adjustment plates 4, 4, 5, 5 is provided below the negative mask main body 3, but adjustment plates 4, 4, 5, 5 are provided above the negative holding plate 2.
It is also possible to provide a storage box 6 with a. In addition, the movement mechanism for the adjustment plates 4, 4, 5, and 5 may be a movement mechanism that allows fine adjustment using a pinion and a rack.

The trimming and negative mask 1 according to the present invention includes:
It can be used as a negative mask for a printer as shown in FIG. The negative mask 1 is attached to the upper opening 26 of the first dark box 25, and the light source 27
The light that has passed through the dimmer filter, cut filter, mirror tunnel, diffuser plate, etc. is subjected to negative mask 1.
The first dark box 25 is entered through the first dark box 25. The first dark box 25 includes a lens 2 for enlarging and projecting the image of the negative film in the negative mask 1.
8 and a screen 29 are arranged. Note that 30 is photographic paper, and 31 is a mirror for reflecting a projected image onto the photographic paper 30. When trimming, first place the mirror 31 at the position indicated by the solid line to prevent exposure of the photographic paper, open the viewing shutter 32, and adjust the adjusting plate of the negative mask 1 while viewing the image projected on the screen. 4, 4, 5, and 5 are moved to form an image of the desired size of the image frame displayed on the screen 29, and after aligning the center with the optical axis, the light from the light source 27 is blocked, Close the viewing shutter 32 and close the mirror 31.
After moving to the position indicated by the chain line, the photographic paper 30 is exposed to light for a predetermined period of time. In such a printer, the screen 29 and photographic paper 30 are housed in a dark box, and a mirror 31 is used, making it difficult to use a paper mask, whereas the negative mask 1 is located outside the dark box. It is extremely easy to adjust the degree of opening of the exposure opening during trimming.

As is clear from the above description, the negative mask for trimming according to the present invention has an exposure opening on the lower surface of the negative mask body that rotatably holds the negative mask or on the upper surface of the negative holding plate, so that the degree of opening is adjusted in the front and rear and left and right directions. Since the adjustment plate is arranged so that it can be slid, the adjustment plate will not be damaged, and the trimming and negative mask can be easily attached to and removed from the printer.Moreover, the adjustment plate can be slid back and forth or left or right. You can perform test firing with just a simple operation, and you can trim to the desired degree of opening with a simple sliding operation in both the front and back and left and right directions. It is possible to carry out normal baking with the adjusting plate open or held in an appropriate position, and processing capacity can be significantly improved, and the magnet can maintain the position of the adjusting plate along the sliding direction of the adjusting plate. Since it is attached, it will not move during exposure even if there is an unexpected impact, and especially for printers where the screen and photographic paper are located in a dark box that is difficult to operate, and only the negative mask is located in a position that is easy to operate. It is indispensably used in the field, and can exhibit excellent practical effects.

[Brief explanation of drawings]

The drawings show an embodiment of a negative mask for trimming according to the present invention, and FIG. 1 is an exploded perspective view of the same, and FIG. 2 is a vertical cross-section of the portion excluding the negative presser plate along the line - in FIG. 1. The cross-sectional view shown in FIG. 1: Negative mask for trimming, 2: Negative holding plate, 3: Negative mask body, 4, 5: Adjustment plate, 6;
Storage box, 7, 8: Exposure opening, 9, 10: Bent protrusion, 11: Film guide protrusion, 12: Through hole, 13: Holding plate, 14: Opening, 15, 20:
Long hole, 16, 21: protrusion, 17, 22: arm, 1
8, 23: Notch, 19, 24: Magnet.

Claims (1)

[Claims] 1. A storage box is fixed to the lower surface of the negative mask main body or the upper surface of the negative holding plate in a negative mask in which a negative holding plate is rotatably supported so as to be able to hold a negative film against the negative mask main body, and The degree of opening of the exposure opening in the front and rear direction is adjusted by sliding the exposure opening in which the negative mask body, the negative presser plate, and the storage box communicate with each other in the front and back direction along a guide member provided in the storage box. Two approximately L-shaped adjustment plates and a guide member provided on the lower surface of the negative mask main body that fixes the storage box or the upper surface of the negative holding plate slide in the left and right direction of the exposure opening, and the exposure two substantially L-shaped adjustment plates for adjusting the degree of opening in the left-right direction of the opening for use, and a magnet capable of maintaining the position of the adjustment plates along the sliding direction of the adjustment plates. A negative mask for trimming, characterized in that it is attached inside a storage box and on the lower surface of a negative mask main body to which the storage box is fixed, or on the upper surface of a negative holding plate.