Abrégé

Rangefinders for cinema cameras may have limited accuracy. Herein, a rangefinder has a set of right lenses and a set of left lenses. A pair of lenses taken one from each side have nominally the same focal length. Different lens pairs have different focal lengths. The rangefinder includes an image detector for each lens. Electronic circuitry connected to the imagers automatically selects which of the pairs of lenses is to be used for range determination. The selection is the pair of lenses with the longest focal length and tightest field of view that can image a target subject in a scene that is being filmed. The selection changes automatically as the target subject moves closer to or away from the cinema camera. By using the longest focal length whenever possible, the overall accuracy of range determination is improved.

Classes IPC  ?

• G01C 3/02 - Mesure des distances dans la ligne de viséeTélémètres optiques Détails
• G01C 3/14 - Mesure des distances dans la ligne de viséeTélémètres optiques en utilisant un triangle parallactique ayant des angles variables et une base de longueur fixe, dans la station d'observation, p. ex. dans l'instrument avec observation binoculaire en un simple point, p. ex. du type stéréoscopique
• G03B 13/18 - Auxiliaires de mise au point

Abrégé

When filming a scene, the focal distance of the video camera is often controlled remotely, and can be switched between manual and autofocus modes. To overcome sudden movements in the lens upon reverting to manual mode, and to avoid disrupting a user's grip on the manual control during autofocus, the traditional distance ring indicator is split into separate controller and indicator components. The controller permits manual input, while the indicator tracks the desired distance. In manual mode, the controller and indicator move in unison. In autofocus mode, the indicator tracks a rangefinder input but the controller is not moved. In a hybrid mode, the controller offsets the rangefinder input. In all cases, the position of the lens moves with the indicator.

Classes IPC  ?

• G03B 3/12 - Mise au point effectuée par force motrice adaptée à la commande à distance
• G03B 3/02 - Dispositions pour la mise au point présentant un intérêt général pour les appareils photographiques, les appareils de projection ou les tireuses par déplacement de l'objectif le long de la plaque de base
• G03B 17/18 - Signaux indiquant l'état d'un organe de l'appareil ou si l'éclairage est convenable
• H04N 23/67 - Commande de la mise au point basée sur les signaux électroniques du capteur d'image

Abrégé

When filming a scene, the focal distance of the video camera is often controlled remotely, and can be switched between manual and autofocus modes. To overcome sudden movements in the lens upon reverting to manual mode, and to avoid disrupting a user's grip on the manual control during autofocus, the traditional distance ring indicator is split into separate controller and indicator components. The controller permits manual input, while the indicator tracks the desired distance. In manual mode, the controller and indicator move in unison. In autofocus mode, the indicator tracks a rangefinder input but the controller is not moved. In a hybrid mode, the controller offsets the rangefinder input. In all cases, the position of the lens moves with the indicator.

Classes IPC  ?

• G03B 13/32 - Moyens de mise au point
• H04N 5/232 - Dispositifs pour la commande des caméras de télévision, p.ex. commande à distance