GB933545A - Television signal source - Google Patents
Television signal sourceInfo
- Publication number
- GB933545A GB933545A GB645/61A GB64561A GB933545A GB 933545 A GB933545 A GB 933545A GB 645/61 A GB645/61 A GB 645/61A GB 64561 A GB64561 A GB 64561A GB 933545 A GB933545 A GB 933545A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- contrast
- image
- light
- camera
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005286 illumination Methods 0.000 abstract 7
- 239000011521 glass Substances 0.000 abstract 3
- 239000007788 liquid Substances 0.000 abstract 3
- 230000003287 optical effect Effects 0.000 abstract 3
- 238000010276 construction Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
Abstract
933,545. Television. FERNSEH G.m.b.H. Jan. 6, 1961 [Jan. 8, 1960], No. 645/61. Class 40 (3). In a television signal source utilizing a pickup tube capable of responding correctly only to images of contrast within a limited range, additional uniform illumination is superimposed upon the image of a scene or object which is projected upon the photo-sensitive member of the pick-up tube and means are arranged when the contrast exceeds said limit to vary the additional illumination so as to reduce the contrast of the image within said range. The invention is of particular application with a tube, such as the image-orthicon and vidicon, and permits such a tube to be used at the same time as another camera, such as a supericonoscope or a kinematograph camera, to view a scene which is lighted with considerable contrast suitable for the other camera. The variation of the additional illumination may be carried out by obtaining a control voltage, preferably by peak rectification, from the video signal produced by the tube. Fig. 4 illustrates the application of the invention to a combined television and kinematograph camera in which the scene to be viewed is imaged by means of an objective lens 18 by way of a partial reflector 19 on the exposure gate of film camera F and is also imaged on the photo-sensitive surface of an image-orthicon tube 25 by means of lenses 22, 24 by way of partial reflectors 23. In accordance with the invention, additional uniform illumination obtained from a source 26 in conjunction with a matt screen and condensing lens 27 is projected through partial reflector 23 so as to superimpose upon the image light reaching tube 25. A light attenuating device 5 is inincluded in the light path to tube 25. Arrangements for adding uniform illumination generally similar to that shown in Fig. 4 are described for use in a camera solely for television, Fig. 1 (not shown), and a film or slide scanner, Fig. 5 (not shown). Another arrangement for adding uniform illumination, Fig. 2 (not shown), comprises a ring of lamps and a cylindrical matt screen surrounding the image optical path immediately following the objective lens. Yet another arrangement, Fig. 3 (not shown), is similar in construction but includes in the light path either a fluorescent liquid confined within the cylindrical screen by two plane-parallel glass plates or a fluorescent glass plate. Reference is also made (without giving details) to the use of a transparent dielectric member making use of the electro-luminescent effect. Preferably the control arrangements are such that when a predetermined contrast is exceeded the amount of the additional illumination is changed by a predetermined amount such as to cause the contrast to be reduced to a second predetermined level. Known electrical means may be employed to equalize the resulting signal contrast in highlights and shadows. The light-attenuating device 5 conveniently comprises two plane-parallel glass plates arranged perpendicular to the axis of the optical path and containing between them a light-absorbing liquid. By altering the separation of the two plates the thickness of light-absorbing liquid in the optical path is varied. Alternatively, an adjustable grey wedge or iris diaphragm may be used.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF30251A DE1096406B (en) | 1960-01-08 | 1960-01-08 | Method and device for recording television images |
Publications (1)
Publication Number | Publication Date |
---|---|
GB933545A true GB933545A (en) | 1963-08-08 |
Family
ID=7093682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB645/61A Expired GB933545A (en) | 1960-01-08 | 1961-01-06 | Television signal source |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1096406B (en) |
GB (1) | GB933545A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1489550A2 (en) | 1994-10-25 | 2004-12-22 | United Parcel Service Of America, Inc. | Automatic electronic camera for label image capture |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1181733B (en) * | 1962-12-04 | 1964-11-19 | Fernseh Gmbh | TV camera with device to protect the receiving tube |
-
1960
- 1960-01-08 DE DEF30251A patent/DE1096406B/en active Pending
-
1961
- 1961-01-06 GB GB645/61A patent/GB933545A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1489550A2 (en) | 1994-10-25 | 2004-12-22 | United Parcel Service Of America, Inc. | Automatic electronic camera for label image capture |
EP1489550A3 (en) * | 1994-10-25 | 2009-05-13 | United Parcel Service Of America, Inc. | Automatic electronic camera for label image capture |
Also Published As
Publication number | Publication date |
---|---|
DE1096406B (en) | 1961-01-05 |
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