DE1926650A1 - Process for the automatic focusing of lenses for recording cameras - Google Patents

Description

ZEISS IKON AKTIENGESELLSCHAFT Stuttgart, then May 23, 1969 to EP 3600-Bttr / Lu. __

"Automatic focusing method of lenses for photo cameras "

The invention relates to an automatic method Focusing lenses for shooting caeras.

Ia is preparing a multitude of procedures of this kind became known,.

Partly, object light is generated by means of photoelectric converters evaluated for focusing, partly through evaluation of reflected parts of a radiation directed at the object, optical, electromagnetic or acous. etisoher kind, a Stelliapuls for the Scharfetellautomatik given.

All of these methods have the disadvantage that the user

ο the object to be sharply focused must be aimed at, Ludam he the

In the middle of the image field. Such a blooming

⁰ ^ In terms of visual design, division can already be done in the standing room

to satisfy nLoht. It will be even more difficult to

σ> gii.iii t) »LJ ¹ L im- odttr · television recordings to be observed» The Ka-

BATHROOM OWGINAL - 2 -

192665C

Merabuser must then use the camera to a moving object like that track that it was hit by the measuring beam · That The object must be kept in the center of the image at all times

The sharp focus of the measuring beam has other features as well Disadvantages «Even a falling leaf that accidentally crosses the measuring beam brings the automatic focus adjustment in confusion. For devices with radiation directed at the object, the device-side focusing device for the measuring beam is complex and expensive.

Despite the sharp focus of the measuring beam, these known methods are also subject to energetic limits. A The camera body, which should be kept as small as possible, offers no space for large energy storage devices with which such Facilities would need to be operated if they were up to acceptable distances should provide sufficiently accurate values For weakly reflecting in the measuring radiation wave range Objects may have to do without such an automatic focusing system.

The invention had the object of providing a method for to find automatic focusing of lenses, which do not adhere to the aforementioned disadvantages. The sewing me object, e.g. a playing child, each stalls should be Lm ο

t ° image can be assigned without being in a hurry ao

^ Sharp one fco L Laut oma fc Ik verziditot become mtD.

ο ■ "■ - ,.

u> Erf induijg »gamäü becomes dia 3«) task by »rf 111 Lt. ,, laß -ium

Recording object aiii irtsbnr is added, Jj.-jjen A ..i'irlfc-Lt

BATH ORIGINAL

an adjusting device assigned to the recording camera evaluated with receiver for automatic focusing of the lens *

The donor attached to the object can be an active one Transmitter, e.g. a shortwave transmitter.

But it is also possible to use a passive encoder, which can be stimulated by means of a transmitter * e.g. from the camera location »

Finally, a reflector can also be used as a transmitter, the radiation emanating from the camera location reflected back.

Another possibility in the invention & ilSen Vpise su procedure is to use "" in an encoder that is "in Modulator for incident energy from the Katneraort and this modulated energy of the receiver of the adjustment device sends back, with as a measure for the lens adjustment the Laufselt des Signal «serves.

Within the scope of the invention, dl · strength of the recipient the distribution device received signals as a measure of dl · Object position can be evaluated. Finally, in applying the procedure, it is possible to go on Several recording objects must distribute several transmitters, the transmitted energy of which is modulated differently or differently from one another, and one assigned to the recording camera To use adjustment device for the lens, which can be switched to these different transmission energies or, modulations, and / or several receivers optionally

0098 ^ 8/0936

BATH ORIGINAL

the adjusting device can be brought into operative connection different Recipient owns.

The process according to the invention can also be used by sending an ultrasonic wave by means of electromagnetic waves emitted by the camera triggered by the object-side encoder and from the runtime of The distance to the object is emitted at intervals of pulses determined and then adjusts the lens. Finally, within the scope of the method according to the invention the encoder also alternates electromagnetic at certain intervals and emit ultrasonic pulses. As a result of different transit times of these impulses change «depending on the changing object distance, including the Lateral distances see the various impulses, from which the automatic · focusing for the lens can be derived.

Any lens setting based on this method can also do without directional radiation. That means that the fine-tuning process can begin before the object is caught by the camera viewfinder.

BATH ORIGINAL

009848/0936

Claims (8)

- 5 patents required 1. Procedure for the automatic focusing of lenses for recording cameras characterized in that the An encoder is added to the recording object, the activity of which is accompanied by an adjustment device assigned to the recording camera Evaluates receiver for automatic focusing of the lens. 2. The method according to claim 1, characterized in that a active encoder is used. 3 · The method according to claim 1, characterized in that a more passive is used by means of a transmitter, e.g. an encoder that can be excited from the camera location. k. Method according to Claim 1, characterized in that a reflector is used as the transmitter. 5. Process according to claims 1, 2 and 3, characterized in that that a modulator is used as a transmitter that modulates incident energy from the Karaeraort to the Erapfän-. ger of the adjusting device, and that the runtime of the signal * serves as a measure for the object value 6 »Method according to claims 1 to h, characterized in that the strength of the recipient der.Veratelleinrioh- 009848/0936 received signals as a measure of the position of the object is upgraded. 7 · The method according to claim 3, characterized in that by means of Electromagnetic waves emitted by the camera location a transmission of ultrasonic waves from the object-side Gebor triggered and the object distance is determined from the transit time of pulses sent out at intervals, and that Lens is adjusted accordingly « 8. The method according to claims 1 to 7 t, characterized in that a plurality of sensors are distributed to a plurality of recording objects, the transmitted energy is modulated differently or differently from each other and an adjustment device assigned to the recording camera is used for the lens, the & ± n®n on these different transmission energies or modulations have switchable receivers and / or several different receivers that can optionally be brought into operative connection with the adjusting device. 9 «The method according to claims 1 to 4, characterized in that the transmitter at certain intervals alternately electromagnet ishe and emits ultrasonic pulses and on the receiver side from the tent changing with the object distance due to the different transit times of these impulses borrowed distances between the various impulses, the focus of the lens is derived ZEISS IKON AKTIENGESELLSCHAFT ^K ± n Geneva / Voiybt. 72/66 0 09848/0936