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    • 82. 发明授权
    • Digital exposure time control circuit with self-timer
    • 具有自拍功能的数字曝光时间控制电路
    • US4019189A
    • 1977-04-19
    • US550030
    • 1975-02-14
    • Kiyoshi KitaiTakeo SaitoYouichi Seki
    • Kiyoshi KitaiTakeo SaitoYouichi Seki
    • G03B7/093G03B9/62G03B9/64G03B7/08
    • G03B7/093
    • A digital exposure time control circuit including a standard pulse generating circuit for developing standard rate pulses which are applied under control of a brightness-time conversion circuit to a dividing circuit, and subsequently counted in a reversible counter operating in a counting mode. The number of standard pulses counted are controlled by the brightness-time conversion circuit to be proportional to an exposure time, and the counted pulses are subsequently read-out from the counter to control exposure time. The exposure time control circuit also includes a self-timer control circuit which is responsive to a predetermined number of counted pulses to clear the reversible counter, and enable the brightness-time conversion circuit when the number of counted pulses exceeds the predetermined number in order to develop a delay time, determined by the predetermined number of pulses to which the self-timer is responsive, before the start of counting the pulses for controlling exposure time.The known electric self-timer circuit of exterior photometric type exposure time control circuit is provided with a delay circuit consisting of condensers, resistors, and other analog components separate from the exposure time control circuit. Camera operation actuates the delay circuit for the self-timer when the self-timer is employed, demagnetizes (excites) the electromagnet for controlling the self-timer time when the self-timer time is ended, mechanically transfers a change-over switch from the delay circuit for the self-timer to the exposure time control circuit by a well-known means, simultaneously opens the shutter blade, and after effecting exposure allows the electromagnet for exposure time control to be demagnetized (excited) thereby closing the shutter blade.For the electric self-timer circuit of an internal photometric type electric shutter control circuit, however no consideration has hitherto been given as to whether the time of exposure is controlled by an analog means or whether it is digitally controlled. From this viewpoint, an addition of an electric self-timer to the internal photometric type electric shutter control circuit may, for example, as in the electric self-timer circuit of the above-said external photometric type electric shutter control circuit wherein the delay circuit for self-timer is separate from the exposure time control circuit, and after elapse of self-timer time, the change-over switch is made to transfer to the exposure time control circuit by a signal generated upon demagnetization (exciting) of the electromagnet for controlling self-timer time thereby to effect memorizing the brightness of a subject and causing the view finder mirror's up going motion. When the mirror goes up, for example, in the case of a focal-plane shutter, exposure is completed by allowing the front shutter curtain to travel first for effecting exposure, and then by travelling the back shutter curtain as the electromagnet for controlling the time of exposure is demagnetized (excited). However, the self-timer circuit system applying the above-said method must also be provided with the delay circuit for the self-timer besides the exposure time control circuit, and since the self-timer time is normally approximately ten seconds, not only the condenser with a high capacitance is required, but the space convenience and cost requirements may be prohibitive. An electric shutter circuit using this type of memory reproducing system is often integrated, usually because it is complicated. And, it is now almost impossible to provide a condenser having a high capacitance in an integrated circuit. As described above, moreover, any bounce of the change-over switch inevitably occurs when the change-over switch is transfered from the self-timer circuit to the exposure time control circuit by a signal obtainable from the electromagnet for controlling self-timer time at the completion of self-timer operation and will cause a big error in subsequent memory actions so that the most reliable changeover switch will be required. Besides, there is a defect such that if memory action is made before completion of memorization when the memory time is long, because the change-over switch is mechanically transfered from the delay circuit for the self-timer to the exposure time control circuit by a signal obtained from the electromagnet for controlling self-timer time control mirror-up movement will begin at the same time and the exposure time control circuit will remain in the memory mode.The present invention eliminates the above-said defect with an exposure time control circuit for a camera electric shutter, with a self-timer in the electric shutter control circuit which is of the type having a digital memory reproducing system in which pulses generated in a pulse generating circuit are memorized in a counting circuit by counting a number which corresponds to the brightness of a subject, and the time of exposure is controlled according to the memory content memorized in the counting circuit in synchronism with the start of shutter actuation. Standard pulses with a given frequency generated in the pulse generating circuit are divided through the counting circuit when the self-timer is operative and memorized after during an elapse of actuating time by the self-timer. Then a signal for starting the shutter opening is generated at the completion time of memorization.The embodiment of the present invention is based upon the exposure time control circuit for electric shutter using a digital memory reproducing system being proposed under the patent application Nos. Sho 48-95005, Sho 48-95006, Sho 48-95007 and Sho 48-95008 by this applicant, to which the self-timer circuit is added.
    • 一种数字曝光时间控制电路,包括标准脉冲发生电路,用于产生在亮度时间转换电路的控制下施加到分频电路的标准速率脉冲,并随后在以计数模式操作的可逆计数器中计数。 计数的标准脉冲数由亮度 - 时间转换电路控制成与曝光时间成比例,随后从计数器读出计数脉冲以控制曝光时间。 曝光时间控制电路还包括自拍定时器控制电路,其响应于预定数量的计数脉冲来清除可逆计数器,并且当计数脉冲数超过预定数量时启用亮度时间转换电路,以便 在开始计数用于控制曝光时间的脉冲之前产生由自拍定时器响应的预定脉冲数确定的延迟时间。
    • 85. 发明授权
    • Photographic camera with automatic exposure control means
    • 具有自动曝光控制装置的照相机
    • US3938165A
    • 1976-02-10
    • US589846
    • 1975-06-24
    • Seizi Asano
    • Seizi Asano
    • G03B7/00G03B7/08G03B7/30G03B9/08G03B9/58G03B9/64G03B17/38
    • G03B9/58
    • A photographic camera having an automatic exposure control means and a self-timer and provided with a shutter release locking means which is operated to lock the shutter release mechanism when the scene brightness is lower than a predetermined level is provided with a shutter locking means nullifying lever which nullifies the effect of the shutter release locking means when desired. Particularly, the nullifying lever is associated with the self-timer so that the self-timer is made operable only when the nullifying lever is in the nullifying position so that the shutter locking means may be nullified every time the self-timer is used. In one preferred embodiment, the nullifying lever is used as a self-timer start lever. In another embodiment, the nullifying lever is used to cover a self-timer start button when the lever is in the position to allow the shutter locking means to operate.
    • 具有自动曝光控制装置和自拍定时器的照相机设置有当场景亮度低于预定水平时操作以锁定快门释放机构的快门释放锁定装置,其具有快门锁定装置无效杆 这在需要时消除了快门释放锁定装置的效果。 特别地,无效杆与自拍定时器相关联,使得仅当无效杆处于无效位置时才使自拍定时器可操作,使得每次使用自拍时,快门锁定装置可能被无效。 在一个优选实施例中,无效杆用作自拍启动杆。 在另一个实施例中,当杆处于允许快门锁定装置操作的位置时,无效杆用于覆盖自拍启动按钮。
    • 86. 发明授权
    • Self-timer for a camera
    • 自拍自拍
    • US3852785A
    • 1974-12-03
    • US45308574
    • 1974-03-20
    • SEIKO KOKI KK
    • OGIHARA MYONEMOTO T
    • G03B9/64G03B9/58G03B17/40
    • G03B9/58
    • A timer in a camera having a depressable camera release plate having a pivoted camera release lever that actuates a shutter release lever when the depressable release plate is depressed for taking exposures. The timer provides for timed exposures and comprises a governor which is manually charged. The governor has a gear that is driven when the governor is charged to actuate an interlocking lever transported on a self-release lever biased to a raised position in which the interlocking lever cams the camera release lever clear of the path of the shutter release lever as the release plate is depressed. The charging of the governor manually automatically sets the timer for a timed exposure and a locking lever actuated by the interlocking lever when at its raised position locks the governor. When the release plate is depressed the interlocking lever effects release of the governor and the movement of the governor causes the gear to move the self-release plate downwardly so that it actuates the shutter release lever.
    • 照相机中的定时器具有可按下的照相机释放板,其具有枢转的照相机释放杆,当按下可释放板被压下以进行曝光时,其驱动快门释放杆。 定时器提供定时曝光,并包括手动充电的调速器。 调速器具有一个齿轮,当调速器被充电以驱动在自动释放杆上传送的互锁杆时,该联动杆被偏压到升高位置,在该升高位置中,互锁杆将照相机释放杆相对于快门释放杆的路径远离, 释放板被压下。 调速器的充电手动自动设置定时器定时曝光和由互锁杆启动的锁定杆,当其升高位置锁定调速器时。 当释放板被压下时,互锁杆实现调速器的释放,并且调速器的运动使齿轮向下移动自动释放板,从而使快门释放杆致动。
    • 87. 发明授权
    • Apparatus for braking and arresting indexible carriers for filters or the like
    • 用于制造和排列不同运输工具的过滤器或类似装置
    • US3836928A
    • 1974-09-17
    • US38440073
    • 1973-08-01
    • AGFA GEVAERT AG
    • KOLEFF BNAGEL E
    • G03B9/64G03B17/12G03B27/73G03B33/08
    • G03B27/73G03B9/64G03B17/12
    • Photographic apparatus wherein a disk which carries several filters is indexible by a friction wheel to move a selected filter to a predetermined position. The disk is braked by a device wherein a pivotable holder supports a bell crank lever one arm of which constitutes a feeler and another arm of which constitutes a braking element for the disk. The holder is pivotable by an electromagnet to move the feeler into the path of projections provided on the disk adjacent to the filters. When an oncoming projection strokes against the feeler, the bell crank lever pivots relative to the holder and moves the braking element into frictional engagement with the peripheral surface of the disk.
    • 承载多个过滤器的盘的摩擦轮可以将选定的过滤器移动到预定位置的摄影装置。 该盘由一种装置制动,其中可枢转保持器支撑一个曲柄杠杆,一个臂构成一个触发器,另一个臂构成盘的制动元件。 保持器可由电磁铁枢转,以将探测器移动到设置在与滤光片相邻的盘上的突起的路径中。 当迎面而来的突起撞击触针时,铃声曲柄杆相对于保持器枢转并且使制动元件与盘的外围表面摩擦接合。