DE1990668U - Exposure device for, in particular, photographic contact copies - Google Patents

Description

ΡΛ1? Ss 41.G-.fi 6a

PATENT ADVOCATE Potentanwalt

DIPL.DfG. AMTHOR ^D »P ^! -% W

"" anfcfurf a.

β ΙΈΑϋΓΚΙΊΤΚΤ Δ, Μ. TEUOTOK (0611) 65 20 23

POSTSCHTIEBSSiOH 180144 9997 Ι / 3ΕΌ

Λ ¹ TVn It l Βί ^ π t ^ r Λ Tif * rt -

Klimsch & Co. “6 Frankfurt / Main Sehmittstrasse 12

"Exposure device for, in particular, photographers Contact copies "

The invention relates to an exposure device for in particular photographs see Kontaktkopienj, which is at the same time can also be used as a multi-purpose imagesetter »

The training of the new device is based on the finding, that the sharpness and clarity of photographic copies is very strongly influenced by the spectral composition of the acting radiation - there is a slight difference in sharpness E.g. between one with green and one with blue Light made copy, but even if you can see the effect of comparing green and violet light is the difference in sharpness insignificant - that surprisingly a considerably better contrast transfer even with the finest details occurs »when visible light is as good as not on the structure of the latent image contributes and this "predominantly or exclusively is generated by ultraviolet radiation «

The device according to the invention is characterized _s that it consists of a flask equipped with bolt carrier UV-transparent with a radiation source with a low light-emitting body expansion and an upstream of this, visible light largely retaining filter, wherein the radiation of the light source in the UV region up to at least 360 nm is enough

To support the effect as a light source, it is advantageous to use a point light lamp, the intensity of which in the ultraviolet is so high that exposure times in the seconds range are achieved »e.g.« 2-2 © seconds » Consider that, in addition to the desired UV, also emit visible light, which has to be filtered out of the radiation, at least in the area of sensitization of the emulsion to be exposed and for which the UV-permeable, visible-light-retaining filter was used according to the invention -Color glass or a. Foil filters «The colored glasses are of the type used, for example, in so-called" black emitters "(commercially available as emitters for fluorescence excitation)." Interference filters can also be used successfully a ¥ ¥ ¥ ¥ The color filter is supposed to hold back light with wavelengths over 43o to at least sofa.

The device is primarily suitable for installation in. Contact = · copier, but can also be in a housing as a carrier

- ³ - ^; ■■ '.- ■ ■■;. ■■

at a suitable distance-from-copy frame or other. Exposure areas are arranged, »

In order to use the device as a multi-purpose imagesetter, the UVi-PiIter is expediently attached with means _{8 so} that it can be removed or exchanged for other color filters «

Because some radiation sources at the moment of switching on not immediately reach their full performance but only gradually to a normal operating continuous output the radiation at power pass and vice versa, z # B "in incandescent maximum is _t but then goes back to the normal power, the shutter is used to "The resulting difficulties of correct dosage to switch off the exposure? Particularly suitable" is a shutter with actuation or release by an electromagnet.

If the device is not light with a designed ^ -diehten housing as a carrier, so the carrier can also ± n an intermediate floor or intermediate wall for installation consist, on which the light source with filters, and four circuit are arranged so that, when the shutter is closed no, when the shutter is open only filtered radiation reaches the copying surface «

The drawing shows two examples «

Fig. 1 shows an embodiment in a vertical center longitudinal section des - exposure device »

Fig. 2 shows a contact copier (broken open) with built-in device in a housing »

Fig. 3 shows schematically a simple copy frame, - above the the imaging unit is attached to a - support »

In the drawing, a color light filter is shown in Figure "1, 1 indicates a serving for light-tight encapsulation housing with built-in lamp base $ 2 and inserted in the socket Ptainktliohtlampe (halogen) 3 designated" h is a fixed to a housing inner wall support frame 5 detachably above the light source 3 held * With the rotary magnet 6, the shutter 7 is controlled in front of the outlet opening 8 of the housing.

In FIG. 2, 9 shows a contact cooper device with a copying surface Io and cover 11 represent, with the below the copy area * E.g. the bottom of the copier permanently or removably inserted exposure device 1.

As Fig. 3 shows, the device can on an arm 12 above a simple copy frame *

Claims (1)

96-4tD * -t 4.68 1. Exposure device for especially photographic contact copies, characterized ₉ that it consists of a carrier with a light source with a small luminous element extension and a UV-permeable visible light upstream of this largely restrained color filter and a shutter « 2 »exposure apparatus according to claim l characterized in _s" that the light source is a point light lamp such as halogen lamp, xenon short arc lamp or high pressure mercury lamp " 3 · Exposure device according to claim 1 and / of 2, since d.-urch characterized ₉ that a thermal protection filter is arranged between the radiation source and the color filter » k. Exposure device according to one or more of claims 1-3} characterized * in that the carrier is designed as a light-tight housing (1) and the color light filter (4) is detachably held «, 5 »Exposure device according to one or more of claims 1 thereby characterized in that the shutter is coupled to an electromagnet that controls it