Method for producing glass film

A method of manufacturing a glass film, the method comprising a cleaving step of cleaving a band-like glass film conveyed in a predetermined conveying direction through irradiation of the glass film with a laser beam,

• wherein the cleaving step comprises:
• a step of, while supporting a lower surface of the glass film by a surface plate comprising an opening, suctioning the glass film through the opening;
• a step of irradiating the glass film suctioned through the opening with the laser beam;
• and
• a step of conveying the glass film by a conveying device having a predetermined pass line,
• wherein the conveying device comprises:
• a first belt that comes into contact with the glass film;
• and
• a second belt that comes into contact with the glass film,
• wherein the first belt and the second belt are arranged so that a contact portion of the first belt with the glass film and a contact portion of the second belt with the glass film have a same vertical height,
• wherein the surface plate is arranged between the first belt and the second belt,
• wherein the pass line is set to a height of positions at which the glass film comes into contact with the first belt and the second belt,
• wherein the surface plate comprises a support portion configured to support the glass film,
• wherein the support portion comprises an upper surface that comes into contact with the lower surface of the glass film,
• wherein the upper surface of the support portion is located above the position where the contact portion of the first belt comes into contact with the glass film, and
• wherein the upper surface of the support portion is located above the position where the contact portion of the second belt comes into contact with the glass film.