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    • 42. 发明授权
    • Zoom lens
    • 变焦镜头
    • US4465342A
    • 1984-08-14
    • US285012
    • 1981-07-20
    • Kazuo TanakaShigeyuki Suda
    • Kazuo TanakaShigeyuki Suda
    • G02B13/18G02B15/163G02B15/173G02B15/14
    • G02B13/18G02B15/173
    • A zoom lens comprising, from front to rear, a first lens component having a positive focal length, a second lens component having a negative focal length and a third group having a positive focal length, the first and second lens components being moved to effect zooming, and the first lens component being moved to effect focusing. The above-described first, second and third lens components are each provided with at least one aspheric lens. The first lens component has a negative third order aspheric quantity and the second lens component has a positive third order aspheric quantity to realize a zoom lens of high imaging performance with fewer constituent lens elements.
    • 一种变焦透镜,包括从前到后具有正焦距的第一透镜部件,具有负焦距的第二透镜部件和具有正焦距的第三组,所述第一和第二透镜部件被移动以实现变焦 并且第一透镜部件被移动以实现聚焦。 上述第一,第二和第三透镜部件各自设置有至少一个非球面透镜。 第一透镜部件具有负三阶非球面量,并且第二透镜部件具有正三阶非球面数量,以实现具有较少成分透镜元件的高成像性能的变焦透镜。
    • 45. 发明授权
    • Zoom element focusable zoom lens
    • 变焦元件可调整变焦镜头
    • US4364642A
    • 1982-12-21
    • US176570
    • 1980-08-11
    • Kazuo TanakaRyusho Hirose
    • Kazuo TanakaRyusho Hirose
    • G02B15/167G02B7/10G02B15/17G02B15/22G02B15/16
    • G02B7/10G02B15/17
    • A zoom objective includes four lens groups of which the first and fourth groups are stationary, while the second and third groups are movable independently of each other. Focus adjustment of one of the second and third groups is followed by zooming relative movement of the latter two. To maintain a constant zoom ratio throughout the entire focusing range, the relative movement of the second and third groups is controlled to effect monotonic variation of the magnifying powers of the second and third groups by means of the following formulae as embodied in a microcomputer.Zoom Ratio=Z[S.sub.1, X.sub.1, X.sub.2 (S.sub.1, X.sub.1)]dZ/dS.sub.1 =Owherein S.sub.1 is the object distance; and X.sub.1 and X.sub.2 are the amounts of movement of the second and third groups with zooming respectively.
    • 变焦目标包括四个透镜组,其中第一和第四组是静止的,而第二组和第三组彼此独立地移动。 第二组和第三组之一的焦点调整之后是后两者的相对移动。 为了在整个聚焦范围内保持恒定的变焦比,控制第二组和第三组的相对运动,以通过微机中体现的以下公式来实现第二组和第三组的放大倍数的单调变化。 缩放比= Z [S1,X1,X2(S1,X1)] dZ / dS1 = O其中S1是物距; X1和X2分别是第二组和第三组的变焦量。
    • 48. 发明授权
    • Accidental flash prevention in a photographic flash device
    • 摄影闪光灯装置中意外防闪光
    • US4160933A
    • 1979-07-10
    • US831525
    • 1977-09-08
    • Kazuo Tanaka
    • Kazuo Tanaka
    • G03B15/05H05B41/30H05B41/32
    • H05B41/32
    • In a photographic flash device comprising a flash discharge tube, for example a xenon discharge tube, a main capacitor which is connected across electrodes of said flash discharge tube and is for storing electric charge to be discharged in said flash tube, a triggering capacitor which is connected in series with a primary coil of a triggering transformer and a synchronous switch, and a voltage indicating glow discharge lamp for indicating completion of charging in the main capacitor.A safety circuit for prohibiting accidental flashing is constituted by comprising a switching means which suspends function of said triggering capacitor.
    • 在包括闪光放电管(例如氙放电管)的照相闪光装置中,主电容器被连接在所述闪光放电管的电极上并用于存储要在所述闪光管中放电的电荷;触发电容器, 与触发变压器和同步开关的初级线圈串联连接,以及指示用于指示主电容器中的充电完成的辉光放电灯的电压。
    • 49. 发明授权
    • Zoom lens having closeup focusing control
    • 变焦镜头具有特写聚焦控制
    • US4124274A
    • 1978-11-07
    • US761960
    • 1977-01-24
    • Kazuo TanakaKunio Takeshi
    • Kazuo TanakaKunio Takeshi
    • G02B7/105G02B15/22G02B15/18
    • G02B7/105G02B15/22
    • A zoom lens comprising a front lens group, a plurality of movable lens groups and an image forming lens group, the front lens group having three sub-groups. The first sub-group counting from the front has a negative refractive power and is movable for focusing purposes. The intermediate or second sub-group has a positive refractive power and is movable for focusing to the front of the third sub-group which has a positive refractive power and which is stationary during focusing. The front lens group is characterized by fulfilling the following relationships: ##EQU1## WHEREIN F.sub.1 AND F.sub.2 ARE THE FOCAL LENGTHS OF THE FIRST AND SECOND SUB-GROUPS RESPECTIVELY; D IS THE AXIAL SEPARATION BETWEEN THE REAR PRINCIPAL POINT OF THE FIRST SUB-GROUP AND THE FRONT PRINCIPAL POINT OF THE SECOND SUB-GROUP OCCURRING WHEN THE ENTIRE SYSTEM IS FOCUSED FOR OBJECT AT INFINITY; A' IS THE OBJECT DISTANCE MEASURED FROM THE FRONT PRINCIPAL POINT OF THE FIRST SUB-GROUP WHEN THE ENTIRE SYSTEM IS FOCUSED FOR AN OBJECT AT A FINITE DISTANCE; AND S and t are the amounts of movement of the first and second sub-groups resulted during focusing from infinity to a closeup at an object distance a' respectively.
    • 一种变焦透镜,包括前透镜组,多个可移动透镜组和成像透镜组,前透镜组具有三个子组。 从前方计数的第一子组具有负屈光力,并且可移动以用于聚焦目的。 中间或第二子组具有正折光力并且可移动以聚焦到具有正折光力并且在聚焦期间是静止的第三子组的前部。 前镜组的特点是满足以下关系: F1和F2是第一和第二个小组的正确长度; D是当第一个子集的后一个主要点与第二个分组的正面主要点之间的轴向分离,当整个系统受到无限期的攻击时, A是当整个系统以有限的距离聚焦对象时,从第一个子组的正面点测量的对象距离; AND S和t分别是在从无限远到物体距离a'处的特写镜头聚焦期间产生的第一和第二子组的移动量。