US3896345A - Photo lock system - Google Patents

Photo lock system Download PDF

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Publication number
US3896345A
US3896345A US502851A US50285174A US3896345A US 3896345 A US3896345 A US 3896345A US 502851 A US502851 A US 502851A US 50285174 A US50285174 A US 50285174A US 3896345 A US3896345 A US 3896345A
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United States
Prior art keywords
transparency
station
key member
detector
sensor
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 - Lifetime
Application number
US502851A
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English (en)
Inventor
Henry R Zink
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US502851A priority Critical patent/US3896345A/en
Priority to CA227,993A priority patent/CA1034657A/fr
Application granted granted Critical
Publication of US3896345A publication Critical patent/US3896345A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B49/00—Electric permutation locks; Circuits therefor ; Mechanical aspects of electronic locks; Mechanical keys therefor
    • E05B49/002—Keys with mechanical characteristics, e.g. notches, perforations, opaque marks
    • E05B49/006—Keys with mechanical characteristics, e.g. notches, perforations, opaque marks actuating opto-electronic devices

Definitions

  • the new system provides an optical or photographic coding which can have unlimited variations and which can be highly personalized.
  • a transparency such as a photographic negative is installed in the receptacle and a complementary transparency such as a positive of the same photograph is utilized in the key number, with access being obtainable only when the complementary transparencies are positioned adjacent to each other.
  • the present system also provides a two-step configuration which not only gives increased protection against unauthorized entry, but which also can provide an alarm or other indication whenentry is attempted utilizing an improper key member.
  • the preferred embodiment incorporates a receptacle with photocells or other radiation sensors at first and second stations, with a transparency at the first station. Positioning the complementary transparency at the first station will normally provide an access signal for actuating a latch or other control device.
  • a receptacle with photocells or other radiation sensors at first and second stations, with a transparency at the first station. Positioning the complementary transparency at the first station will normally provide an access signal for actuating a latch or other control device.
  • FIG. 1 illustrates an access control system incorporating the presently preferred embodiment of the invention
  • FIG. 2 is a perspective view illustrating the relationship of the receptacleand key member
  • FIG. 3' is' an exploded view illustrating the construction of the receptacle of FIG. 1.
  • FIG. 1 The system illustrated in FIG. 1 includes a receptacle 10, a key member 11, a control circuit 12, and a latch 13.
  • a typical receptacle construction is shown in greater detail in FIG. 3 and includes plates l8, 19 carried in spaced relation by sides 20, 21 defining a slot 22 between the plates for receiving the key member 11.
  • a stop 23 is mounted between the plates at one end thereof.
  • the receptacle components typically are made from plastic sheet stock, cut to size and cemented together.
  • Openings 26, 27 are provided in the plate 19 for receiving photocells 28, 29 resepectively, which function as radiation sensors. Similar openings (not shown) are provided in the plate 18 for receiving lamps 30, 31 which serve as radiation sources. As shown in FIG. I,
  • lamp 30 directs radiation across the slot 22 to the sensor 28 and lamp 31 directs radiation across the slot to sensor 29.
  • the lamps are connected to a power source via leads 32.
  • leads 32 Of course, other radiation sources and sensors can be utilized as desired and in one alternative configuration, a single lamp can serve as a radiation source for both sensors.
  • the system includes complementary transparencies, typically a negative and a positive of a photograph.
  • One of the transparencies, the negative 35 in the embodiment illustrated, is mounted in the receptacle at one of the openings for the photocell 28 and lamp 30.
  • the other transparency, in this embodiment a positive 36, is carried by the key number 11.
  • the key member is a strip of 16 mm film with the positive printed directly on the film.
  • the image of the positive is positioned on the key member so as to be exactly superimposed over the image of the negative 35 when the key member is fully inserte into the receptacle.
  • the remainder of the key member or at least those portions which move past the opening 27 as the key member is inserted, has an average radiation transmission characteristic substantially the same as that of the positive 36. This is readily accomplished by providing an overall gray shade for the remainder of the film strip equal to the average density of the positive.
  • the film strip forming the key member may be protected by laminating between plastic cover sheets.
  • the photocell 28 is connected in series with a variable resistor 40 across a voltage source at terminals 41, with the junction of the photocell and resistor connected as an input to an integrated circuit 42, typically a Signetics NE 555 2 or a Motorola MC 1555.
  • the circuit 42 provides an access signal on output line 43 indicating that a proper key member has been inserted into the receptacle.
  • the access signal may be utilized for any purpose including actuation of an access control device, an indicator, a recording device or the like.
  • the access signal is utilized to actuate the latch '13 by energizing a solenoid 45 through a transistor amplifier 46, with the solenoid functioning to remove a bolt 47 from a jamb 48.
  • the system is initially adjusted by inserting the properly coded key member part way into the receptacle, with the key member at the sensor 29 but not at the sensor 28.
  • the resistor 51 is varied to provide a zero voltage at input terminal 2 of the integrated circuit 52, with no blocking signal on the output line 53.
  • Resistor 40 is adjusted to provide a voltage at input terminal 2 of integrated circuit 42 such that there is no access signal on the output line 43 except when there is no radiation at sensor 28.
  • the system is now ready for use.
  • a person seeking access inserts a key member into the slot of the receptacle.
  • the resistance of the photocell increases and the voltage at terminal 2 of circuit 52 decreases. If the gray scale or average transmission characteristic of the inserted key member is proper, the voltage at terminal 2 will be zero.
  • the transparency 36 will be in line with'the transparency 35 providing a complete blocking of light transmission to the sensor 28..
  • the resistance of the sensor 28 goes up and the voltage at terminal 2 of integrated circuit 42 goes down sufficiently to provide an output at line 43, which for the specific circuits illustrated is about +9 volts. This is the access signal, indicating that a properly coded key member has been inserted into the receptacle.
  • the gray scale or average transmission of the key member is less than that for the properly coded key member, less light will arrive at the photocell 29 resulting in a darker field, with a higher resistance for the photocell and a lower or negative voltage at terminal 2 of integrated circuit 52, which produces an output on line 53.
  • This output is the blocking signal and typically is about +9 volts.
  • the blocking signal can be utilized to actuate an alarm.
  • the connection of the blocking signal to terminal 1 of integrated circuit 42 serves to block or prevent operation of the circuit to provide an output at line 43, regardless of the signal at input 42.
  • a time delay may be used with the units 42 and 52 so that once the circuit has been triggered to provide an output, this output will be maintained for a preset length of time. Typically the time is several minutes and permits the person with the properly coded key member to remove the key member and perform other acts such as opening a door, entering a building and deactivating an alarm system within the permitted time interval.
  • the time delay may be obtained by means of a typical RC circuit, as by connecting a resistor 55 between terminals 8 and 6, 7, and a capacitor 56 between terminal 6, 7 and circuit ground of unit 42.
  • a similarRC circuit may be used for the unit 52.
  • a receptacle having a first station and a second station and including means defining a slot for receiving a key member for movement past said first station to said. second station;
  • a key member having a second transparency which is the complement of said first transparency with said second transparency positioned on said key member to move past said second station to said .first station as said key member is inserted into said slot, and with at least the portions of said key member which are at said second station during insertion having an average radiation transmission characteristic substantially the same as that of said second transparency.
  • transparencies are a photographic positive and a photographic negative.
  • said receptacle includes spaced plates providing said slot therebetwe'en, each of said plates having an opening at said first stationand at saidsecond station for receiving said sensors and a radiation source.
  • a system as defined in claim 1 including:
  • a first detector having an input and an output
  • first circuit means connecting said first sensor to said first detector input, with said first detector providing an access signal at the output thereof when a complementary second transparency is opposite said first transparency blocking substantially all radiation to said first sensor.
  • a second detector having an input and an output
  • third circuit means connecting said blocking signal to said first detector for blocking any access signal output.

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  • Lock And Its Accessories (AREA)
US502851A 1974-09-03 1974-09-03 Photo lock system Expired - Lifetime US3896345A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US502851A US3896345A (en) 1974-09-03 1974-09-03 Photo lock system
CA227,993A CA1034657A (fr) 1974-09-03 1975-05-28 Systeme de verrouillage a cellules photoelectriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US502851A US3896345A (en) 1974-09-03 1974-09-03 Photo lock system

Publications (1)

Publication Number Publication Date
US3896345A true US3896345A (en) 1975-07-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
US502851A Expired - Lifetime US3896345A (en) 1974-09-03 1974-09-03 Photo lock system

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US (1) US3896345A (fr)
CA (1) CA1034657A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177657A (en) * 1976-04-16 1979-12-11 Kadex, Inc. Electronic lock system
US4292541A (en) * 1977-06-14 1981-09-29 Bernd Ambrosius Safeguard or lock device
US4369481A (en) * 1980-04-24 1983-01-18 David Early Electronic lock
US4411144A (en) * 1976-04-16 1983-10-25 Kadex, Inc. Electronic lock system
US4534194A (en) * 1981-03-16 1985-08-13 Kadex, Incorporated Electronic lock system
US4629941A (en) * 1985-01-07 1986-12-16 Ellis Edward H Differential illumination sensitive switching circuit
FR2682206A1 (fr) * 1991-10-07 1993-04-09 Pierret Jean Jacques Dispositif de controle d'acces d'une ouverture utilisant un systeme de code a barres miniaturise logeable dans un objet usuel.
US6169650B1 (en) * 1998-05-11 2001-01-02 John M. Albrecht Single access control system and method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3514611A (en) * 1968-01-26 1970-05-26 Intern Dryer Corp Electrically actuated security system
US3772650A (en) * 1973-02-01 1973-11-13 Folger Adams Co Control and response systems and units
US3787714A (en) * 1972-08-25 1974-01-22 S Berens Electronic lock and key systems employing paired key and master coding modules
US3793565A (en) * 1972-09-11 1974-02-19 G Smith Polarized light-controlled combination door lock
US3835297A (en) * 1970-02-05 1974-09-10 Inoue Michiro Microfilm provided with color codes and device for recording and reproducing such codes
US3845362A (en) * 1973-08-20 1974-10-29 B Roe Electronic lock

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3514611A (en) * 1968-01-26 1970-05-26 Intern Dryer Corp Electrically actuated security system
US3835297A (en) * 1970-02-05 1974-09-10 Inoue Michiro Microfilm provided with color codes and device for recording and reproducing such codes
US3787714A (en) * 1972-08-25 1974-01-22 S Berens Electronic lock and key systems employing paired key and master coding modules
US3793565A (en) * 1972-09-11 1974-02-19 G Smith Polarized light-controlled combination door lock
US3772650A (en) * 1973-02-01 1973-11-13 Folger Adams Co Control and response systems and units
US3845362A (en) * 1973-08-20 1974-10-29 B Roe Electronic lock

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177657A (en) * 1976-04-16 1979-12-11 Kadex, Inc. Electronic lock system
US4411144A (en) * 1976-04-16 1983-10-25 Kadex, Inc. Electronic lock system
US4292541A (en) * 1977-06-14 1981-09-29 Bernd Ambrosius Safeguard or lock device
US4369481A (en) * 1980-04-24 1983-01-18 David Early Electronic lock
US4534194A (en) * 1981-03-16 1985-08-13 Kadex, Incorporated Electronic lock system
US4629941A (en) * 1985-01-07 1986-12-16 Ellis Edward H Differential illumination sensitive switching circuit
FR2682206A1 (fr) * 1991-10-07 1993-04-09 Pierret Jean Jacques Dispositif de controle d'acces d'une ouverture utilisant un systeme de code a barres miniaturise logeable dans un objet usuel.
US6169650B1 (en) * 1998-05-11 2001-01-02 John M. Albrecht Single access control system and method

Also Published As

Publication number Publication date
CA1034657A (fr) 1978-07-11

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